API Security Testing

A web-application test includes the browser-facing application, while a dedicated API assessment concentrates on REST, GraphQL or gRPC interfaces and their authentication, authorisation, data handling and business logic. We use available schemas and test different roles, object access and multi-step workflows that may not be reachable through the user interface. The two scopes can be combined where the application and API form one attack surface.

Scanners are useful for known vulnerability patterns and some configuration errors, but authorisation and business-logic flaws require an understanding of who should be allowed to perform each action on each object. We manually vary identities, state and request sequences to determine whether access controls hold across realistic workflows.

Ideally, provide an OpenAPI/Swagger or GraphQL schema, test accounts for each relevant role, authentication-flow documentation and a staging or production-safe environment. If no specification exists, we can reconstruct much of the surface from application traffic or source code, although this may increase effort and leave undocumented endpoints harder to confirm.

Yes. Where technically suitable, validated abuse cases can be converted into regression tests for your CI/CD pipeline. We also re-test remediated code and explain the root cause and recommended control pattern to the development team.

It can provide technical evidence relevant to PSD2 or open-banking security, NIS2 risk-management measures and DORA resilience testing, depending on the organisation and scope. Findings can be mapped to the OWASP API Security Top 10 and agreed control requirements. The test supports compliance evidence but does not by itself establish legal compliance.