Business Logic Flaws: The Vulnerabilities Automated Tools Can’t See
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A business logic flaw isn’t a bug in the traditional sense. The code runs exactly as written — the problem is that what it was written to do creates an exploitable gap. A checkout flow that lets a discount code apply twice. A password reset that doesn’t verify the account it’s resetting. Nothing crashes, nothing throws an error.
This is precisely the category of issue that pattern-matching tools are worst at catching, because there’s no malformed input to detect. The request is well-formed. The vulnerability lives entirely in the workflow’s assumptions.
Finding these requires actually understanding what a feature is supposed to do, then testing what happens when someone uses it in a way it wasn’t designed for.
