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Last updated: April 29, 2026
Why mobile APIs are weaker, device registration abuse, auth patterns, business logic, client-side validation bypasses.
The mobile app is a client. Behind it is an API — and the API is where most impactful mobile-pentest findings live. This module covers testing that API surface specifically from a mobile context: endpoints the web app does not call, weaker auth assumptions, and the parameter fields that mobile-only flows tend to trust.
Why mobile APIs are often weaker
- Developers assume the mobile client is harder to inspect and reason about — so they trust it more
- Mobile backends often expose more endpoints than the web backend — device registration, push tokens, in-app-purchase receipts
- Mobile sessions often last longer (weeks to months) with refresh tokens; compromise is higher value
- Rate limiting is often looser on mobile endpoints to accommodate poor network conditions
- Mobile APIs often carry device identifiers that are treated as authentication factors — rarely correctly
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