31/03/2026
Had a conversation with a CISO last month who told me, "We run three different scanners — we're covered."
I asked one question: "Do any of them test what happens when a user submits a negative number in the quantity field of your checkout?"
Silence.
That's the gap nobody talks about. The most dangerous bugs in web applications aren't the ones with CVE numbers — they're the ones unique to YOUR business logic. A coupon code that can be reused infinitely through a race condition. A payment step that can be skipped entirely. A role parameter an attacker can add to their own profile update request. HackerOne reports show these logic flaws regularly earn $50K+ bounties individually, and no scanner on the planet catches them because no scanner understands what your app is supposed to do — only what it actually does.
After thousands of hours testing Fortune 500 apps, I can tell you: the clean scanner report is often the most dangerous document in your security program. It creates confidence where there should be curiosity.
Honest question — when was the last time someone tested your application's business logic, not just its inputs?
