Endpoint-level intent
Start from routes, methods, schemas, and documented or observed contracts rather than relying on browser navigation to discover coverage.
API pentesting
Test API Authorization and Data Boundaries Beyond the Web UI
Assess API routes, tokens, objects, inputs, and service trust boundaries directly, including behavior that a browser-facing web test may never exercise.
Object authorization
Examine whether identities can read or modify resources outside their intended tenant, account, or role boundaries.
Service trust
Test how tokens, inputs, and upstream or downstream assumptions shape the impact of a reachable endpoint.
Coverage is organized around contracts, identities, and objects
An API assessment can cover exposed routes, methods, parameters, request bodies, authentication mechanisms, authorization rules, error behavior, and data returned across representative identities. Documentation, schemas, sample requests, and scoped credentials improve coverage. Undocumented behavior may be explored where authorized, but completeness cannot be inferred solely from traffic observed in a front end.
- Authentication and token handling across permitted client types.
- Object- and function-level authorization between users, roles, or tenants.
- Input validation, injection paths, data exposure, and unsafe server-side actions.
API intent is not a renamed web application test
A web application test evaluates complete browser-facing workflows, including sessions and front-end state. An API test addresses the service interface directly: routes that may support mobile clients, partners, internal services, or automation, as well as methods the web interface never calls. The scopes overlap when a web application consumes an API, but they should retain separate coverage maps and test objectives.
- API coverage should enumerate routes, methods, versions, and identity contexts.
- Web coverage should enumerate pages, browser states, and user journeys.
- Shared findings should state which interface and trust boundary made exploitation possible.
Method: build an identity matrix, then test permitted transitions
After agreeing scope and safety constraints, the assessment maps available operations and expected authorization for each supplied identity. Tests can then vary object identifiers, methods, payloads, tokens, and sequence to identify inconsistent enforcement. Where a weakness is observed, validation should demonstrate the minimum safe impact needed to make the risk clear.
- Use non-production or controlled test data where practical.
- Compare expected and observed behavior across representative identities.
- Preserve request and response evidence needed for reliable reproduction.
Outputs expose tested boundaries as well as gaps
Results can include a route and identity coverage summary, validated findings, reproduction requests, impact context, and remediation direction. Limitations should identify unavailable schemas, missing roles, inaccessible service-to-service flows, and rate or safety constraints. A tested API version does not establish the security of other versions, private interfaces, or clients that were outside scope.
- State the affected endpoint, method, identity, object, and prerequisite.
- Separate confirmed exploitability from behavior that needs further investigation.
- Recommend design or enforcement changes without claiming a single fix secures the entire API.
Frequently asked questions
What should we provide for an API pentest?
Useful inputs include authorization to test, endpoint documentation or schemas, representative credentials or tokens, expected role boundaries, safe test data, and explicit exclusions. The assessment can still begin with less information, but coverage limitations should be recorded.
How is API pentesting different from web application pentesting?
API testing directly evaluates routes, methods, schemas, tokens, and object access, including interfaces not exposed in a browser. Web testing follows pages, sessions, and complete user-facing workflows. Neither should silently stand in for the other.
Can API testing cover authenticated authorization flaws?
Yes, when suitable identities and permission to exercise them are provided. Comparing users, roles, and tenants is central to object- and function-level authorization testing.
Does an API pentest prove all endpoints are secure?
No. Results apply to the routes, versions, identities, data, and techniques tested. Undocumented, unreachable, or out-of-scope interfaces remain limitations.
Define your next security mission
Tell us the target type and desired outcome. Sensitive scope details are collected after qualification.
Discuss a scoped assessment