API Security
Testing and hardening the APIs your applications and integrations actually run on.
Who this is for: Businesses whose applications, mobile apps, or integrations depend on APIs, especially ones exposed to third parties or the public internet.
The Problem
APIs are often tested less rigorously than the applications they power, and broken authentication or excessive data exposure in an API can leak far more than the front-end ever shows a user.
Our Solution
We test APIs specifically against the OWASP API Security Top 10, authentication, authorization, and data exposure, not just the web application built on top of them.
What's included
- Authentication and authorization testing
- Broken object-level authorization (BOLA) testing
- Excessive data exposure review
- Rate limiting and abuse-prevention review
- API key and token security review
- Documentation and inventory of undocumented (“shadow”) APIs
This is a natural companion to our Web Application Security service, testing the application’s front-end doesn’t tell you whether its underlying API quietly returns more data than the front-end displays, or whether one user can access another user’s records by changing an ID in the request.
Benefits
- Authentication and authorization tested at the API level, not assumed from the front-end
- Excessive data exposure caught before it’s exploited
- A documented inventory, including APIs nobody remembered were still live
Our Process
Inventory
Map every API, including undocumented ones.
Test Authentication
Verify authentication and authorization can’t be bypassed.
Test Data Exposure
Check whether responses leak more than intended.
Report
Severity-ranked findings your developers can act on.
Retest
Confirm fixes actually closed the finding.
Frequently asked questions
Is this included in Web Application Security or separate?
API testing is included when it’s part of a Web Application Security engagement; this page exists for businesses whose primary concern is specifically their APIs, such as integration partners or a mobile app backend.
What if we don’t have documentation for all our APIs?
That’s common, and discovering undocumented (“shadow”) APIs is part of the inventory step, they’re often the least reviewed and highest-risk.
Especially relevant for
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Not sure if this is the right fit?
Tell us what's worrying you. We'll tell you what actually needs fixing first.