API Penetration Testing Services

What our API penetration testing covers

API endpoints frequently expose more functionality and data than the frontend that consumes them — and are commonly missed by scanners tuned for traditional web pages. We import your OpenAPI/Swagger spec, Postman collection, or intercept live traffic through Burp Suite Professional's proxy to build a complete endpoint inventory, then manually test authorization on every route rather than only the ones a UI exposes.

• Broken Object Level Authorization (BOLA) — The most common and most damaging API flaw: testing whether one user can access or modify another user's objects by manipulating IDs.
• Broken authentication — JWT signature and expiry validation, OAuth2 flow abuse, API key handling, and token leakage.
• Broken function-level authorization (BFLA) — Verifying that low-privilege accounts cannot reach admin-only or internal endpoints.
• Excessive data exposure & mass assignment — Checking whether responses leak fields the client shouldn't see, and whether requests can set fields they shouldn't control.
• Rate limiting & resource consumption — Testing for unrestricted resource consumption that enables brute-force, scraping, or denial-of-service via API abuse.
• GraphQL-specific testing — Introspection exposure, query depth/complexity abuse, and batching attacks where GraphQL is in scope.

Why choose eNeoteric for API penetration testing

• OWASP API Security Top 10 aligned — Testing structured against the current OWASP API Security Top 10, not a generic web checklist retrofitted onto APIs.
• Spec-driven & traffic-driven testing — We test from your OpenAPI/Swagger/Postman definitions and from live-captured traffic, so undocumented or "shadow" endpoints get covered too.
• CERT-In empanelled — Reports built to the evidence standard Indian regulators and auditors expect.
• Certified testers — OSCP, OSWE, and eWPT certified engineers with dedicated API security experience.
• Re-test included — A complimentary re-test confirms every finding has been remediated before your next release or audit.

Frequently asked questions

How is API penetration testing different from web application penetration testing?

A web application pentest covers the full application — UI, session handling, client-side logic — while an API pentest focuses specifically on the endpoints themselves, including ones the frontend never calls. Authorization testing is far more granular in an API engagement: every endpoint and HTTP method is tested independently for BOLA and BFLA, which a UI-driven test would miss.

Do you test GraphQL APIs?

Yes. We test for introspection exposure, excessive query depth/complexity, batching abuse, and the same authorization issues (BOLA/BFLA) that affect REST APIs, adapted to GraphQL's query structure.

What do you need from us to scope an API pentest?

Ideally an OpenAPI/Swagger specification or Postman collection, plus test accounts at each privilege level (e.g. standard user, admin, and a second standard user account to test cross-account access). Without a spec, we can also build the endpoint inventory by intercepting live application traffic.

Do you test authentication mechanisms like OAuth2 and JWT?

Yes — JWT signature validation, algorithm confusion, expiry and refresh-token handling, and OAuth2 flow abuse (redirect URI manipulation, scope escalation) are all in scope for an API engagement.

How long does an API pentest take?

Typically 4-8 business days depending on the number of endpoints, distinct privilege levels, and whether GraphQL is in scope. We confirm a fixed timeline once scoping is complete.