API Pentest

What is API Penetration Testing?

APIs are the backbone of modern applications, and they are among the most targeted attack surfaces. Broken authentication, excessive data exposure, missing authorization checks, and business logic flaws are routinely missed in code review alone and require active testing to surface.

We test REST, GraphQL, and legacy API interfaces for the full OWASP API Security Top 10 and beyond. Testing covers authentication flows, authorization logic, injection vectors, rate limiting, and how your API behaves under adversarial conditions. Every finding is validated by a human ethical hacker.

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What does the API pentest scope cover?

Authentication and session management

Broken Object Level Authorization (BOLA/IDOR)

Broken Function Level Authorization

Mass assignment and parameter tampering

Injection flaws (SQL, NoSQL, command injection)

GraphQL introspection and batching abuse

Rate limiting and resource exhaustion

Sensitive data exposure and error handling

How do we test your APIs?

Authentication Testing

We test login flows, token handling, session management, and OAuth implementation for flaws that allow account takeover, token forgery, or unauthorized access.

Authorization and Access Control

We systematically test whether users can access resources, functions, or data they should not. BOLA, BFLA, and privilege escalation via parameter manipulation are validated across all identified endpoints.

Business Logic and Injection

We go beyond the OWASP list and test for business logic flaws specific to your API. This includes injection in all input fields, GraphQL-specific attack vectors, and chained vulnerabilities that automated scanners miss.

Frequently Asked Questions

We test REST APIs, GraphQL APIs, and legacy SOAP or XML-based interfaces. We also cover mobile app backends, internal microservice APIs, and third-party integrations where scope allows.

Yes, we use the OWASP API Security Top 10 as a baseline but go beyond it. Real attackers do not stop at a checklist. We test business logic, chained vulnerabilities, and environment-specific weaknesses that automated tools and checklist approaches miss.

Typically two to five days, depending on the number of endpoints, authentication complexity, and scope. We provide a timeline estimate after reviewing your API documentation or a sample collection.

An executive summary, a technical report with evidence per finding, severity ratings aligned to CVSS, and prioritized remediation steps. Retesting is available after fixes.

How does an API pentest work?

Scope and documentation

We review your API documentation, Postman collection, or OpenAPI spec to understand the endpoint landscape before testing begins.

Endpoint enumeration

We map all accessible endpoints including undocumented or legacy routes that may not appear in official documentation.

Authentication and authorization testing

We test all auth flows and systematically verify access control across roles, users, and data objects.

Active exploitation and chaining

We attempt to chain findings and validate exploitability under realistic attack conditions.

Report and remediate

Technical report with evidence, severity ratings, and clear fixes. Retesting available after remediation.

Test Your APIs Before an Attacker Does

Identify authentication flaws, authorization bypasses, and injection vulnerabilities across your REST or GraphQL API surface.