API authorization testing
API authorization testing verifies that every endpoint enforces who can do what — at three levels: object (can you reach another user's data), function (can a normal user hit admin actions) and property (can you set fields you shouldn't). Sintropyc tests all three across real roles and proves each gap.
The three ways API authorization fails
- Object level (BOLA) — reaching another user's object by its ID. The number-one OWASP API risk.
- Function level (BFLA) — a standard user calling an admin-only or higher-privilege action the UI simply hides.
- Property level (mass assignment) — sending extra fields like
role=adminoris_verified=truethat the server blindly saves.
Why authorization is the hardest thing to scan
Injection or XSS are input bugs — a scanner can fuzz for them. Authorization is a decision: it depends on who you are, what you own and what your role permits. There's no payload to send; you have to be two different users and compare what each is allowed to do. That's why authz flaws dominate real breaches and slip past automated tools.
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.
Sintropyc enumerates your API (OpenAPI/GraphQL or observed traffic), builds a matrix of roles and actions, and probes each cell — a low-privilege user reaching high-privilege functions, one account reaching another's objects, and requests with extra properties injected. Every reported gap comes with the request that worked and the effect it had.
What you get
- Object-, function- and property-level authorization tested across roles
- Each finding mapped to the OWASP API Top 10
- Proven effect — privilege gained or data reached, not theory
- The fix and a retest once you ship it
Common questions
Do you support GraphQL and REST?
Both. Sintropyc reads OpenAPI or GraphQL schemas when available and otherwise learns the surface from traffic.
Is authorization testing included in a standard scan?
Yes — object, function and property-level authorization are core to every Sintropyc run, alongside injection, IDOR and business-logic testing.
Can the report go to an enterprise security team?
Yes. Findings are human-reviewed, mapped to OWASP, and each carries a reproducible proof — built to satisfy a customer's security review.