Business logic vulnerability testing
A business logic vulnerability is an attack made entirely of valid requests that break the rules your app assumes everyone follows — paying zero, replaying a coupon, ordering a negative quantity, skipping a workflow step. There's no malformed payload to scan for. Sintropyc learns your flows, tries to abuse them, and proves the ones that work.
Why scanners are blind to logic flaws
A scanner looks for known-bad patterns — an injection string, a dangerous header. Business logic abuse uses perfectly well-formed requests; nothing looks wrong at the byte level. The vulnerability is in what the request means, which requires understanding your product: who the user is, what state they're in, and what should and shouldn't be allowed.
Common business logic abuses
- Payment / price manipulation — tampering amounts, currencies or quantities; completing an order without a successful charge
- Coupon and credit abuse — replaying, stacking or brute-forcing discount codes
- Workflow bypass — reaching step 3 without doing steps 1–2 (skip email verification, checkout, approval)
- Quantity and limit abuse — negative or huge values, race conditions on balances or stock
- Account and referral abuse — self-referrals, trial resets, one-per-customer bypasses
How Sintropyc tests it
Sintropyc is an autonomous AI penetration testing agent. It signs in as real users across different roles, drives your product the way a customer would, and proves every finding with a working exploit — never a scanner guess. Each finding is checked by a human before it reaches you, comes with the exact fix, and is attacked again after you ship it to confirm it held.
For business logic, Sintropyc drives your product like a real user across roles and states, forms hypotheses about the rules each flow assumes, and tries to break them — tampering values, replaying and reordering steps, racing concurrent requests. A finding is only reported when the abuse actually succeeds, with the exact sequence of requests as proof.
Why this is where real money is lost
Logic flaws don't crash anything or trip an alert — they quietly cost revenue, leak entitlements or let one user act as another. They're also the flaws bug-bounty hunters pay off with, precisely because automated tools never surface them. Testing them is the difference between a checklist scan and a real security review.
Common questions
Can this really be automated?
The tedious part — enumerating flows, replaying and racing requests across roles — is exactly what an agent does well. Sintropyc generates and tests hypotheses at scale, and every reported flaw is human-reviewed for real business impact.
Do you need to understand our product first?
Sintropyc learns it by using it, and a short note on your key flows and limits makes testing sharper. Findings come with the concrete steps, so your team can confirm the impact immediately.
Is this included in a standard scan?
Yes — business logic testing is core to every Sintropyc run, alongside IDOR, injection and authorization testing.