API SECURITY PENETRATION TESTING
In-depth penetration testing of REST, GraphQL, and gRPC endpoints across multiple authentication tokens and multi-step workflows.
Is this right for you?
When to choose this service
API Testing Focus Areas
- Broken Object Level Authorization (BOLA) and Broken Function Level Authorization (BFLA)
- JWT implementation flaws and OAuth 2.0 / OIDC flow vulnerabilities
- Mass Assignment, object injection, and excessive data exposure
- Rate limiting enforcement and resource exhaustion (DoS) resilience
What you receive
- Endpoint, role and object-access matrix
- Confirmed multi-identity attack scenarios
- OWASP API Security Top 10 mapping
- Safe curl/HTTP or test-code reproduction examples
- Developer remediation guidance for the authorisation layer
- Regression-test candidates for CI/CD and retest status
Delivery flow
From scope to a verified result
Scope and safety boundaries. Confirm the objective, systems, roles, environment, exclusions, authorised actions and emergency stop contact.
Information and access. Receive only the documentation, accounts, configuration or evidence needed for the work through a secure channel.
API & Microservice Security Audit. We evaluate endpoint authorization, data leakage vectors, and business logic flaws.
Validation and reporting. Confirm findings, remove false positives and connect each risk to business impact and an accountable owner.
Workshop and follow-through. Explain priorities, answer delivery teams, agree remediation timing and perform a retest where included.
Before we start
Frequently asked questions
How long does an engagement usually take?
Timing depends on the number of systems, roles, environments, available documentation and agreed constraints. After initial information is received, the scope states the stages, customer involvement and a specific schedule.
What should we prepare before work starts?
Usually we need a system or process owner, current scope, access and test accounts, architecture or process information, critical business scenarios and an emergency contact. Never send passwords through a normal website form.
Will we receive only a technical report?
No. The standard output includes an executive summary, prioritised detail, evidence, remediation guidance and a results workshop. Where relevant, the engagement includes a retest or implementation roadmap.
Why does an API test need several accounts?
Object- and function-authorisation flaws appear when comparing what different users, roles or tenants may do. A single administrator account cannot demonstrate that isolation between customers works.
What if no OpenAPI documentation exists?
Endpoints can be reconstructed from application traffic, code or gateway logs, but this increases effort and may miss rarely used functions. After the assessment, create a maintained API inventory and add schema validation to delivery.
Related next steps
Web App Testing
In-depth testing of authentication, complex multi-role authorization (BOLA/IDOR), session integrity, and business logic flaws.
Mobile App Testing
Comprehensive binary analysis, insecure local storage review, reverse engineering resistance, and backend API testing on physical devices.
Code Review & DevSecOps
Manual and automated static code analysis, SAST/SCA tool calibration, and automated security gates in your CI/CD pipeline.
AI Governance & Compliance
Testing prompt injection resistance, RAG data leakage, autonomous agent permissions, and Generative AI application security.