business-logic-vulnerabilities

Business logic vulnerabilities are workflow and money-flaw exploits that abuse multi-step processes like payment tampering, race conditions, and IDOR, differing from injection flaws by manipulating intended state-machine transitions and authorization gaps rather than syntax.

You test for IDOR and authorization gaps by validating RBAC residue, checking token and cookie consistency across endpoints, and probing cross-endpoint data leakage to verify that access controls enforce proper privacy boundaries.

The best way to detect race conditions in payment flows is by modeling business processes as state-machine transitions, then probing for step skipping, replay attacks, and illegal state transitions during concurrent transactions.

You check for price tampering and coupon abuse by targeting negative, decimal, and overflow values in value handling, testing rounding errors, and verifying that client-trusted status fields are not accepted by the server.

Yes, business logic testing applies to web and API services by verifying CAPTCHA enforcement, password reset workflows, and KYC privacy weaknesses through parameter trust classification and checklist-driven validation of real business impact.