A mobile app needs a manual penetration test when automated checks cannot answer the risk: it handles sensitive data or money, introduces a new authentication or storage design, or is about to ship a major change. Automated scans find known issues. A person finds how weaknesses chain together.
What a manual test adds
Automated tools match patterns and known vulnerabilities. A tester reads how the app is designed, tries to misuse it, and combines small findings into a real attack path. OWASP's MASTG lists manual code review as part of static analysis, next to automated source code analysis, and treats dynamic analysis as its own topic. The guide organizes tests by the MASVS control groups, which is a useful scoping device.
Examples of things people find that scanners rarely do:
- an authorization rule that exists only in the app and not on the server,
- a flow where skipping a screen skips a check,
- sensitive data in places the scan did not look, such as backups and logs.
Decision guide
| Your situation | Suggested approach |
|---|---|
| Low risk app, no accounts, no sensitive data | Automated checks and dependency scanning, review yearly |
| Accounts and personal data | Automated checks each release, manual test at launch and after major changes |
| Payments, health or financial data | Manual test before launch and at a regular cadence, plus customer or regulator expectations |
| New login, key storage or cryptography design | Manual review of that design before it ships |
| After a serious incident | Manual test of the affected areas |
Your contracts and regulators may set their own expectations. Read those before you decide.
How to scope a test
- List the MASVS control groups that matter most for your app.
- Share the architecture, the backend API and a test account.
- Ask for both client and server testing, since many issues sit on the server.
- Agree on how findings are rated and retested.
- Decide who fixes what and by when.
Prepare so the money is well spent
Run your own checks first. A tester who spends hours reporting an outdated library you could have found in CI is not testing the interesting parts. Clear known issues with dependency scanning, then hand over the build.
Also fix the process. A pentest is a snapshot, so tie findings to an owner and a ticket, and keep the report with the release record.
Quick check
Does a clean automated scan mean I can skip a pentest?
Not if the risk calls for one. A clean scan says no known issues were found by that method, not that the design is sound.
How often should I test?
It depends on risk, contracts and how often you change sensitive features. Tie it to major releases as a starting point.
Safeguard helps you arrive at a pentest with the dependency side clean, through SBOM and dependency scanning and reachability analysis. It does not replace manual testing or perform MAST. You can run a free scan. For how the OWASP documents fit together, see MASVS, MASWE and MASTG.
Sources
Last reviewed: 19 October 2026.
