Top OWASP 2025 .NET Vulnerabilities You Must Address

Mirko PetersPodcasts15 hours ago52 Views


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If you’ve ever thought your net app is safe just

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because you’re running the latest framework, this might be the

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wake up call you didn’t expect. O wasp’s upcoming update

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emphasizes changes worth rethinking in your architecture. In this video,

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you’ll see which O WASP twenty twenty five categories matter

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most for a net, three things to scan for in

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your pipelines today, and one common code pattern you should

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fix this week. Some of these risks come from everyday

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coding habits you might already rely on. Stick around. We’ll

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map those changes into practical steps your net team can

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use today. The categories you didn’t see coming. The categories

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you didn’t see coming are the ones that force teams

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to step back and look at the bigger picture. The

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latest O WASP update doesn’t just shuffle familiar risks. It

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appears to shift attention toward architectural and ecosystem blind spots

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that most developers never thought to check. That’s telling because

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for years, many assumed that sticking with the latest net version,

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enabling defaults, and keeping frameworks patched, would be enough. Yet

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what we’re seeing now suggests that even when the runtime

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itself is hardened, risks can creep in through the way

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components connect the dependencies you rely on and the environments

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you deploy into. Think about a simple real world example.

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You build a micro service in bolt net that calls

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out to an external API, straightforward enough, But under the

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surface that service may pull in you get packages you

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didn’t directly install, nested dependencies buried three or four layers deep.

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Now imagine one of those libraries gets compromised. Even if

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you’re fully patched on Net eight or nine, your code

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is suddenly carrying a vulnerability you didn’t put there. What

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happens if a widely used library you depend on is

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compromised and you don’t even know it’s in your build.

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That’s the type of scenario o WASP is elevating. It’s

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less about a botched query in your own code and

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more about ecosystem risks spreading silently into production supply chain.

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Concerns like this aren’t hypothetical. We’ve seen patterns in different

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ecosystems where one poisoned update propagates into thousands of applications overnight.

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For dot net, Neuget is both a strength and a

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weakness in this regard. It accelerates development, but it also

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makes it harder to manually verify every dependency each time

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your pipeline runs. The WASP shift seems to recognize that

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today’s breaches offten come not from your logic, but from

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what you pull in automatically without full visibility, and that’s

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why the conversation is moving toward patterns such as software

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bills of materials and automated dependency scanning. Will walk through

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practical mitigation patterns you can adopt later, but the point

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for now is clear. The ownership line doesn’t stop where

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your code ends. The second blind spot is asset visibility.

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In today’s containerized en ed deployments. When teams adopt cloud

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native patterns, the number of artifacts to track usually climbs fast.

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You might have dozens of images spread across registries, each

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with its own base, layers and dependencies, all stitched into

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a cluster. The challenge isn’t writing secure functions, it’s knowing

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exactly which images are running and what’s inside them. Without

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that visibility, you can end up shipping compromise layers for

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weeks before noticing. It’s not just a risk. In theory,

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the attack surface expands whenever you lose track of what’s

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actually in production. Framing it differently. Frameworks like net eight

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have made big strides with secure by default authentication, input validation,

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and token handling. Those are genuine gains for developers, but

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attackers don’t look at individual functions in isolation. They look

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for the seams. A strong identity library doesn’t protect you

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from an outdated base image in a container. A hardened

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minimal API doesn’t erase the possibility of a poisoned new

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GAT package flowing into your micro service. These new categories

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are spotlighting how quickly architecture decisions can overshadow secure coding practices.

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So when we talk about categories you didn’t see coming,

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we’re really pointing to risks that live above the function

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level too. You should focus on today. Supply chain exposure

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through new GET and visibility gaps in containerized deployments both

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hit dot net projects directly because they align so closely

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with how modern apps are built. You might be shipping

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clean coat and still end up exposed if you overlook

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either of these. And here’s the shift that makes this interesting.

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The owa’s update seems less concerned with what mistake a

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single developer made in a controller and more with what

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architectural decisions entire teams made about dependencies and deployment parts.

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To protect your apps, you can’t just zoom in, you

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have to zoom out now. If new categories are appearing

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in the top ten, that also raises the opposite question,

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which ones have dropped out? And does that mean we

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can stop worrying about them? Some of the biggest surprises

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in the update aren’t about what got added at all.

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They’re about what quietly went missing. What’s missing and why

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You’re not off the hook? That shift leads directly into

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the question we need to unpack now what happens to

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the risks that no longer appear Front and center in

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the latest O was bliss. This is the piece called

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what’s missing and why You’re not off the hook, and

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it’s an easy place for teams to misjudge their exposure.

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When older categories are de emphasized, some developers assume they

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can simply stop worrying about them. That assumption is risky.

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Just because of vulnerability isn’t highlighted as one of the

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most frequent attack types doesn’t mean it has stopped existing.

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The truth is many of these well known issues are

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still active in production systems. They appear less often in

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the research data because newer risks like supply chain and

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asset visibility now dominate the numbers. But lower visibility isn’t

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the same as elimination. Injection flaws illustrate the point. For decades,

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developer training has hammered at avoiding unsafe queries, and in

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need has introduced stronger defaults like parameterized queries through Entity Framework.

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These improvements drive incident volume down, Yet attackers can still

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and do take advantage when teams slip back into unsafe habits.

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Lower ranking doesn’t mean gone, it means attackers still exploit

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the quieter gaps. Legacy components offer a similar lesson. We’ve

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repeatedly seen problems arise when older libraries or passes hang

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around are noticed. Teams may deprioritize them just because they’ve

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stopped showing up in the headline categories. That’s when the

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risk grows. If an outdated XML passer or serializer has

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been running quietly for months, it only takes one abuse

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path to turn it into a direct breach. The main

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takeaway is practical, don’t deprioritize legacy components simply because they

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feel old. Attackers often exploit precisely what teams forget to monitor.

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This is why treating the top ten as a checklist

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to be ticked off line by line is misleading. The

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ranking reflects frequency and impact across industries during a given timeframe.

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It doesn’t mean every other risk has evaporated. If anything,

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a category falling lower on the list should trigger a

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different kind of alert. You must be disciplined enough to

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defend against both the highly visible threats of today and

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the quiet ones of yesterday. Security requires balance across both

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on the net side. Insecure Civilization is a classic example.

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It may not rank high right now, but the flow

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still allows attackers to push arbitrary code or read private

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data if developers use unsafe defaults, many teams reach for

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jacent libraries or rely on long standing patterns without adding

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The Guardrail’s newer guidance recommends attacks don’t have to be

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powerful in volume to be powerful in damage. A single

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overlooked deserialization flow can expose customer records or turn into

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a stepping stone for deeper compromise. Attackers, of course track

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this mindset. They notice that once a category is no

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longer emphasized, development teams tend to breathe easier code written

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years ago, lingers, unchanged audit rules are dropped, Patching slows

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down For an attacker, these conditions create easy wins. Instead

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of competing with every security team focused on the latest

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supply chain monitoring tool, they target the forgotten injection vector

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still lurking in a reporting module or an unused service endpoint,

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exposing data through an obsolete library from their specse if

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it takes less effort to go where defenders aren’t looking.

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The practical lesson here is straightforward. When a category gets

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less attention, the underlying risk often becomes more attractive to attackers,

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not less. What disappeared from view still matters, and treating

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the absence as a green light to deprioritize is short sighted.

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For dot net teams, the defensive posture should always combine

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awareness of emerging risks with consistent care for so called

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legacy weaknesses. Both are alive, one is just louder than

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the other. Next, we’ll put this into context by looking

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at the kinds of every day net code patterns that

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often map directly into these overlooked risks. Some of the

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most overlooked risks aren’t hidden in new frameworks or elaborate exploits.

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They’re sitting right inside code you may have written years ago.

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This is the territory of hidden traps, where ordinary entity

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patterns that once felt routine are now reframed as security liabilities.

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The unsettling part is that many of these patterns are

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still running in production, and even though they seemed harmless

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at the time, they now map directly into higher risk

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categories defined in today’s threat models. One of the clearest

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examples is weak or partial input validation. Many projects still

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rely on client side checks or lightweight rejects filtering, assuming

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that’s enough before passing data along. It looks safe until

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you realize attackers can bypass those protections with ease. Add

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in the fact that plenty of NEAT applications still deserialize

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objects directly from user input without extra screening, and suddenly

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that old performance shortcut becomes a structural weakness. The concern

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isn’t a single mist bug, it’s the way repeated use

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of these shortcuts quietly undermined system resilience over time. Another

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common case is the forgotten debug feature left open. A

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developer may spin up an endpoint during testing, use it

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for tracing, then forget about it when the service moves

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into production. Fast forward months later and an attacker discovers it,

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using it to step deeper into the environment. What once

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seemed like a harmless helper for internal diagnostics turns into

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an entry point classified today as insecure design. The catch

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is that these mistakes rarely look dangerous until someone connects

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the dots from small debugging aid to pivot point for

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lateral movement. To illustrate how subtle these risks can be,

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picture a very basic get endpoint that fetches a user

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by idings at ND look my code on the M

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three sixty five show blog post for this podcast. On

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the surface, this feels ordinary, something you or your teammates

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may have written hundreds of times in ef core or link.

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But underneath it exposes several quiet pitfalls. There’s no type

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constraint on the ID parameter. There’s no check to confirm

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the caller is authorized to view a specific user. There’s

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also no traceability. No longer is recorded if repeated unauthorized

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attempts are made. Now, imagine this lives in an API

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gateway in front of multiple services. One unprotected pathway can

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ripple across your environment. Here’s the scenario to keep in mind.

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What if any logged in user simply changes the ID

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string to another value in the request. Suddenly one careless

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line of code means accessing someone else’s profile or worse,

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records across the entire database. It doesn’t take a sophisticated

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exploit to turn this oversight into a data breach. So

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how do you tighten this endpoint without rebuilding the entire app?

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Three practical fixes stand out. First, strongly type and validate

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the input. For example, enforce a guide or numeric constrained

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in the root definitions, or malicious inputs don’t slip through unchecked. Second,

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enforce an authorization check before returning any record. Add authorize

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and apply a resource based check so the caller only

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sees their own data. Third, add structured logging to capture

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failed authorization attempts, giving your team visibility into patterns of

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abuse before they escalate. These steps require minimal effort, but

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eliminate the most dangerous blind spots in this routine bit

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of code. This shift in perspective matters. In the past,

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discussions around secure code often meant debating whether or not

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a single statement could be injected with malicious values. Now,

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the focus is broader. Context matters as much as syntax.

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A safe looking method in isolation can become the weak

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link once it’s exposed in a distributed cloud hosted environment.

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The design surface, not the line of code, defines the

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attack surface. Newer dot net releases do offer stronger templates

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and libraries that can help, particularly around identity management and routing,

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but those are tools, not safeguards. By default. You still

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need to configure authorization checks, enforce validation, and apply structured

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error handling ding. The newest framework version doesn’t automatically undo

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unsafe coding habits that slipped into earlier bills. Guardrails can

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reduce friction, but security depends on active effort, not passive inheritance.

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The real takeaway is simple. Some of the riskiest patterns

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in your applications aren’t the new lines of code you’ll

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write tomorrow. They’re the familiar routines already deployed today. Recognizing

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that reality is the first step toward cleaning them up.

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It also raises a bigger question. If many of these

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traps are already in your code base, how do you

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prevent them from creeping back in during the next project.

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But that’s where process and workflow matter just as much

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as code and why the next step is about designing

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security into the way you build software from the start,

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not bolting it on at the eed, designing security into

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your sun’s net workflow. Most development teams still slip into

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the habit of treating security as something that gets checked

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right before release. Features get built, merged, deployed, and only

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afterward do scanners or external pen tests flag the problems.

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By that point, your choices are limited. You either scramble

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to patch while users are waiting, or you accept the

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risk and hope it doesn’t blow up for the next cycle.

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It’s no surprise this pattern exists. Release schedules are tight,

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and anything that doesn’t produce visible features often feels optional.

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The catch is that this lagging approach doesn’t hold up anymore.

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Changes in oap’s latest list reinforced that problems are tied

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just as much to how you build as to what

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you code. If the threats are in the workflow itself,

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Waiting until the end guarantees you’ll always be reacting instead

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of preventing. Instead of treating security checks like late stage firefighting,

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use the OAP categories as inputs upfront. If issues like

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asset visibility or supply chain exposure are highlighted as systemic risks.

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Then the moment you add a new NUGAD dependency or

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publish a container image, that risk is already present. Scanning

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later won’t erase it. Embedding security into the design process

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at every stage means you intercept those exposures before they

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harden into production. And it’s about making security a default

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part of how your pipeline runs, protecting by prevention, not

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by cleanup. Right now, many teams technically have policies, but

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those policies live in wikis, not in actual code. Architects

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write pages about input validation, parameterized queries, or how to

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manage secrets. Everyone nods, But once sprint pressure builds, convenience

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wins out, pull requests slip past, and the written guidance

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barely registers in the day to day. That’s not bad intent.

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It’s simply how software delivery works under pressure. Unless those

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rules are baked into tools, they collapse quickly. Dependency checks

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are a good example. Plenty of pipelines happily built and

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ship software without auditing packages until after deployment. To put

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it more directly, if a malicious dependency makes it through.

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The warning comes only once customers already have the compromise built.

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The bottom line is that testing security after deployment is late.

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You want those warnings before a release ever leaves CCD.

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That’s why modern net defsec ops approaches and bed safeguards

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earlier think automated static analysis wired into every commit, dependency

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audits that run before build artifacts are packaged, and even

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merged checks that block pull requests containing severe issues. None

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of these rely on developers remembering wiki rules. They operate

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automatically every time code moves today. For example, you could

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enable automatic dependency auditing within your built pipeline, and you

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could add generation of a software bill of materials as

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BOM at every release. Both steps directly increase visibility into

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what’s shipping without slowing developers down. Platform features reinforce this direction.

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Minimal APIs and bondnet eight don’t push you toward broad

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exposed endpoints. They encourage safer defaults. Built in authentication libraries

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integrate with standard identity providers, meaning token handling or claims

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validation doesn’t require custom and error prone code. These are

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not just extras, their guardrails. When you use them, you

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reduce both the risk of danger shortcuts and the developer

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overhead of securing everything by hand. A clear way to

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frame these practices is through the add workflow. Each stage

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maps neatly to a concrete security action. In analysis, inventory,

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your components build a list of every dependency and asset

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before adding them to a project. In design, run a

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lightweight thread model to highlight insecure design choices while you’re

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still working on diagrams. In development, integrate static analysis and

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dependency checks directly into CE so problems are flagged before

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mergers complete. In implementation, configure your deployment pipeline to block

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releases that fail those checks. And in evaluation, schedule periodic

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refreshes of your threat models so they align with the

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most current risks. These concrete steps aren’t abstract, They are

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practical recommendations that and need teams can start applying immediately.

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The result is a workflow that stops being reactive and

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starts being resilient. Caught during design, a risky pattern costs

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minutes to address. Found during evaluation, it costs hours found

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in production, it may cost months or worse reputational trust.

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The more you shift left, the more your team saves

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what feels like security overhead at first ends up buying

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you predictability and fewer last minute fire drills. In short,

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designing security into the workflow isn’t about paperwork or box ticking.

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It’s about structuring processes. So the right decision is the

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00:15:44.799 –> 00:15:48.320
easy decision. That way, developers aren’t relying on memory or intent.

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They’re guided by built in checks and platform support. And

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the real test comes next. Once you’ve built this workflow,

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how do you confirm that it’s working? How do you

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00:15:56.360 –> 00:15:59.039
measure whether the safeguards you’ve integrated actually align with the

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risks or waspisofre lagging. Now, that’s the next challenge we

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need to unpack measuring your application against twenty twenty five standards.

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Measuring your application against twenty twenty five standards means shifting

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your yardstick. The question isn’t whether your pipeline is showing

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a green check mark. It’s whether the tools you’re relying

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00:16:14.080 –> 00:16:17.240
on actually map to the risks developers face Now, too

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00:16:17.240 –> 00:16:21.240
many teams still use benchmarks built around yesterday’s threats, and

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00:16:21.279 –> 00:16:24.240
that gap creates a dangerous illusion of safety. Passing scans

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00:16:24.240 –> 00:16:27.080
may reassure, but reassurance is not the same thing as resilience.

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This is a common failure mode across the industry. Companies

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00:16:29.840 –> 00:16:33.480
lean on outdated security checklists thinking they’re current, but those

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lists often carry more weight for compliance than for protection.

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You still see forms focused on sequal injection or SSL

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settings from a decade ago, while whole categories of modern

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00:16:42.919 –> 00:16:46.399
risk like improper authorization flows and supply chain compromise don’t

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even make the page. When teams celebrate compliance, they confuse

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completion with coverage. OWASP twenty twenty five makes the distinction clearer.

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Compliance doesn’t equal security, and the difference matters more than ever.

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The real pitfall comes from assuming that passing existing tests

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means you’re covered. Pipelines may show that all dependencies are

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fully patched and static analysis found nothing critical, yet those

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00:17:08.359 –> 00:17:11.640
same tools often miss structural flaws. A common failure mode,

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particularly in net environments, is broken object level authorization. Automated

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tools may not be designed to spot a case where

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a user tweaks an ID in a request to pull

333
00:17:20.839 –> 00:17:23.200
data that isn’t THEIRS. On paper, the app looks fine.

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In reality, the GAP’s wide open. The tools weren’t negligent,

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they simply weren’t measuring what attackers now target most To

336
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close that gap, evaluation has to adapt. This doesn’t mean

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throwing out automation, it means layering it with checks aligned

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to modern categories. Three practical steps stand out for any

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00:17:39.200 –> 00:17:43.200
bouton by net team. First, design automated integration tests that

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assert object level authorization. A quick example, run a test

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where one signed in user tries to access another user’s

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00:17:49.720 –> 00:17:52.279
record and confirm the API response with a four or

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00:17:52.279 –> 00:17:56.039
three second Adopt API level scanning tools that test authorization

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and identity flows. Instead of checking for outdated libraries, these

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00:18:00.319 –> 00:18:02.720
simulate real requests to see if roll checks and token

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validation behaviors expected. Third, round out what automation misses by

347
00:18:07.119 –> 00:18:12.160
running quarterly thread modeling workshops. Gather developers, architects, and security

348
00:18:12.240 –> 00:18:15.599
leads to ask what if questions that stretch across services.

349
00:18:15.920 –> 00:18:18.480
What if a container registry entry is outdated, or what

350
00:18:18.519 –> 00:18:21.319
if a messaging Q leaks data between tenants. None of

351
00:18:21.319 –> 00:18:23.920
these steps are heavy to implement, but they shift evaluation

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00:18:23.960 –> 00:18:26.880
from box checking to risk mapping. The important point is

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matching your tools to the actual thread model. Tooling scores

354
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can absolutely be misleading if the tools aren’t aligned to

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the categories you’re most vulnerable to. A polished dashboard showing

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00:18:35.400 –> 00:18:38.960
zero issues is worthless if it doesn’t consider authorization weaknesses

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or hidden dependencies. Instead of blindly chasing one hundred percent,

358
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focus on whether your checks are answering the hard questions

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or WASP is raising. Can your process confirm that only

360
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authorized users see their own data? Can it show exactly

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which dependencies ship in every build? Can it surface architectural

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risks that appear when services interact. If the answer is no,

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your score is incomplete, no matter how good it looks

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on paper. Minu review still earns a place in this

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mix because design risks can’t be scanned into the open logic.

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Flaws often arise from how services fit together, the gaps

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between components, not the lines of code inside them. Workshops

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where teams simulate misuse cases and identify architectural weak spots,

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are where these issues surface. They’re also where developers internalize

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the difference between writing good code and designing secure systems.

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That’s the culture shift overs twenty twenty five pushes toward,

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and why measurement today has to include both technical scans

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and human review. The payoff here is simple. You stop

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measuring success by old metrics and start measuring against the

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risks attackers actually exploit. Right now, for dot net teams,

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that’s a sharper focus on authorization, visibility into supply chain dependencies,

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and validation of how cloud native services combine in production.

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Treating evaluation as an ongoing cycle rather than a static

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00:19:49.519 –> 00:19:52.759
gait means you catch tomorrow’s week spots before they become

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00:19:52.920 –> 00:19:55.960
yesterday’s breach. So here’s a question for you directly. If

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you had to add just one security control to your

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cipipeline this week, would it be an authorization test or

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a supply chain check? Drop your answer in the comments.

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00:20:03.880 –> 00:20:06.960
Your ideas might spark adjustments in how other teams approach this,

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00:20:07.400 –> 00:20:09.359
because at the end of the day, measurement isn’t about

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filling out checklists. It’s about resetting how you define secure development.

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And once you start changing that definition, it leads naturally

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into the broader insight. The standards themselves aren’t just pointing

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out code mistakes. They’re pointing to how our development practices

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need to change. So what should you leave with from

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00:20:26.039 –> 00:20:29.000
all of this? Three clear moves to keep in mind. First,

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map OASP twenty twenty five categories to your architecture, not

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just to your code. Second, design security into your CIICD

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pipeline now, don’t leave it as an afterthought. Third measure

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00:20:40.160 –> 00:20:42.960
with modern tests and regular threat modeling, not old checklists.

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If this breakdown helped, hit like and subscribe so you

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00:20:45.880 –> 00:20:49.119
don’t miss future walkthroughs, and drop a comment which of

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00:20:49.200 –> 00:20:52.880
the new O WASP categories feels like your biggest blind spot.

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00:20:53.079 –> 00:20:55.680
Your answers help surface the real challenges and net teams

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face day to day. If you’re rebuilding a pipeline or

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00:20:58.240 –> 00:21:00.480
want a quick checklist, I can point you to let

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00:21:00.480 –> 00:21:02.960
me know in the comments will highlight the most common

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00:21:03.000 –> 00:21:04.440
asks in future discussions.





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