API and Mobile Security Testing
The brain of a modern application is its API. The interface may look secure, but data flows through the API — and that is where the real gaps live. Mobile apps meanwhile ship as APK/IPA files that anyone can obtain; every secret inside them becomes public.
What we test on the API side
Endpoint discovery
Undocumented (shadow) API endpoints, legacy versions (v1/v2), administrative routes.
Authorization flaws (OWASP API Top 10)
Reaching another user's object (BOLA), property-level authorization (BOPLA), function-level authorization (BFLA).
Authentication
JWT: algorithm confusion (alg:none), weak signatures, expiry checks. OAuth 2.0: redirect validation, code interception, scope escalation.
GraphQL specifics
Is introspection open, is there a depth limit, resource exhaustion via batched queries, field-level authorization.
Abuse cases
Is there rate limiting, is automated enumeration blocked, is scraping prevented.
Input validation
Mass assignment, type confusion, injection.
What we test on the mobile side
- Embedded secrets — API keys, private keys, database credentials hardcoded in the app
- Certificate pinning — can traffic be intercepted
- Local storage — tokens or data stored unencrypted on the device
- Root/jailbreak detection — can it be bypassed
- Screen protection — is content hidden when the app goes to background
- Deep links — can an external trigger open an unauthorized screen
Why this needs separate testing
A web test sees the browser side; in the API you are talking directly to the data layer. And a compiled mobile application is an open book to anyone who can read code. Testing API and mobile together with the web layer is what surfaces chained scenarios — for example, reaching the API with a key leaked from the mobile app.
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