API Penetration Testing
REST, GraphQL, and SOAP APIs tested against the OWASP API Security Top 10 — the vulnerability class that most often sits behind a mobile app, single-page app, or partner integration.
OWASP API Security Top 10 Coverage
Broken Object-Level Authorization
Whether one user can access or modify another user's objects by changing an ID.
Broken Authentication
Token issuance, expiry, refresh flows, and weak credential handling.
Broken Property-Level Authorization
Excessive data exposure and mass assignment on write endpoints.
Unrestricted Resource Consumption
Missing rate limiting, pagination abuse, and resource-exhaustion vectors.
Broken Function-Level Authorization
Admin or privileged endpoints reachable by standard user roles.
Injection
SQL, NoSQL, and command injection through API parameters and headers.
Improper Asset Management
Undocumented, deprecated, or shadow API versions still reachable in production.
Security Misconfiguration
Verbose errors, permissive CORS, missing security headers, and default credentials.
Insufficient Logging
Whether abuse and exploitation attempts would actually be detected.
Spec-Driven, Then Manual
With documentation
An OpenAPI/Swagger spec, Postman collection, or GraphQL schema lets us achieve full endpoint coverage quickly and spend more testing time on manual exploitation.
Without documentation
No spec is fine — we proxy traffic from the web or mobile client that consumes the API and reconstruct the endpoint map through manual exploration.
API Testing Questions
Do you test GraphQL APIs?
Yes, including introspection abuse, batching/resource-exhaustion, and authorization checks across nested queries and mutations.
Do you need multiple test accounts?
Yes — at least two accounts per role are ideal, so we can test whether one user's session can access another user's data.
Is this different from web application testing?
A web app engagement already covers the APIs it calls. Standalone API testing is for a backend consumed by multiple clients (mobile, partners, third parties) beyond a single web front end.
Ready to Test Your API?
Share your spec or client app and we'll scope the right engagement.