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19/08/2026 4:07 pm
TL;DR: Mobile APIs are now a primary attack surface because exposed keys, weak attestation, and reverse engineering can let attackers impersonate apps or abuse backend logic, according to Guardsquare. The stronger pattern is to combine secure SDLC practices, code hardening, RASP, and server-side attestation so security moves with release velocity instead of chasing it.
NHIMG editorial — based on content published by Guardsquare: Securing Mobile APIs: A Proactive, Developer-Centric Approach
By the numbers:
- 74% of organisations report that their app development teams are under pressure to accelerate release velocity.
- 71% acknowledge that this speed has compromised mobile app security.
- 95% of 10, % of 10,000 Android apps studied contained misused cryptography APIs.
Questions worth separating out
Q: How should security teams protect mobile APIs from app impersonation?
A: Use layered controls that verify the app, the runtime, and the request path.
Q: Why do mobile APIs create more security risk than web-only APIs?
A: Mobile APIs create more risk because the attack surface depends on runtime behavior as well as the endpoint itself.
Q: What breaks when mobile secrets are stored in client code?
A: Client-side secrets turn the app into a reusable credential source if the binary is reverse engineered.
Practitioner guidance
- Remove client-side secrets from mobile builds Audit mobile code for embedded API keys, tokens, certificates, and hardcoded endpoints.
- Instrument mobile CI/CD with automated security testing Run SAST and IAST as part of release pipelines so misused cryptography, insecure transport, and exposed API patterns are identified before deployment.
- Enforce runtime integrity checks with RASP Use runtime controls to detect hooking, rooting, jailbreaking, and emulator-based abuse, then block high-risk API calls or degrade functionality when integrity checks fail.
What's in the full article
Guardsquare's full article covers the implementation detail this post intentionally leaves at the control-design level:
- Operational examples of code hardening techniques such as name obfuscation, control flow obfuscation, and string encryption.
- How runtime checks can block rooted, jailbroken, or instrumented devices before API misuse reaches backend services.
- Server-side attestation policy logic for revoking trust from a tampered app version without redeploying the client.
- Developer workflow examples for fitting mobile security testing into CI/CD without slowing release cadence.
👉 Read Guardsquare's analysis of mobile API security controls and app attestation →
Mobile API security: are your development controls keeping up?
Explore further
19/08/2026 4:41 pm
Mobile API security is now an identity problem, not just an application problem. When APIs are embedded in mobile workflows, the client becomes part of the trust chain and the app itself acts like a distributed identity surface. That means secrets, attestation, and runtime integrity all influence whether a request should be trusted. Practitioners should treat the mobile app as a governed access participant, not just a code artifact.
A question worth separating out:
Q: How should teams decide whether attestation is required for an API?
A: Use attestation whenever the API fronts customer data, payment flows, account actions, or privileged backend operations. If spoofed app traffic would create fraud, data loss, or abuse at scale, attestation should be mandatory and revocation should be controlled centrally by the server team.
👉 Read our full editorial: Mobile API security needs shift-left controls, not just runtime fixes
