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API Security Testing

We assess APIs for authorization flaws, authentication weaknesses, excessive data exposure, and business-logic issues — the risks that automated tools routinely miss.

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APIs are where authorization quietly breaks

APIs power modern applications, and they fail in distinct ways — most often around authorization. We test your API for object-level and function-level access control, authentication weaknesses, data exposure, and logic flaws, using the OWASP API Security Top 10 as a knowledge framework (not a certification).

What we test

Testing is tailored to your application's architecture and the agreed scope — not every area applies to every system. Common areas include:

  • Authentication
  • Authorization
  • Object-level authorization (BOLA/IDOR)
  • Function-level authorization
  • Excessive data exposure
  • Rate limiting
  • Input validation
  • Injection
  • Business logic
  • Token handling
  • Session handling
  • API versioning
  • Error handling
  • Mass assignment
  • Sensitive data exposure
  • Privilege escalation

Our testing approach

We map your API's endpoints, roles, and data flows, then test authorization boundaries by hand across roles and objects — the class of flaw scanners consistently miss. Findings are validated and explained with concrete request/response evidence.

What you receive

  • A report focused on API-specific risk
  • Each validated finding with severity and business impact
  • Sanitized request/response evidence
  • Remediation guidance for your engineers
  • One complimentary remediation retest for qualifying engagements

Example finding

An illustration of the finding format you can expect. It is fictional and not from any client engagement.

HIGHObject-level authorization flaw (BOLA)

One tenant can read another tenant's records by supplying a different object ID.

FICTIONAL DEMONSTRATION — NOT A CLIENT REPORT

Who it's for

SaaS platforms, mobile and web app backends, and any product exposing a REST or GraphQL API where accounts hold sensitive data.

What affects pricing

Pricing depends on the number of endpoints, roles, authentication model, and how much business logic is in scope. Every engagement is quoted after a short scoping conversation, so you know the price before testing begins.

See pricing

FAQ

Common questions

Yes. The approach differs, but authorization, data exposure, and logic testing apply to both.
Yes — APIs are tested directly. We'll need documentation or a collection (e.g. OpenAPI/Postman) and test credentials where possible.
There's overlap, but API testing goes deeper on object- and function-level authorization, data exposure, and API-specific logic.

Ready to scope this assessment?

Tell us what you'd like tested. Testing only begins after written authorization and an agreed scope.

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