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Mobile penetration testing
Testing a mobile app and the services it talks to for security flaws.
What it means
Mobile penetration testing is a security test of a mobile app, on Android, iOS or both, together with the servers it talks to. A tester examines the app package, how it stores data on the phone, how it communicates, and what the backend does with the requests it receives.
The work has two halves. One is the app on the device: local storage, permissions, secrets inside the code and resistance to tampering. The other is the backend, since every request the app makes can also be made without the app, using other tools.
Why it matters
A phone is a device you do not control. Users can root or jailbreak it, inspect the traffic, read local files and unpack your app. Anything you placed in the app, such as an API key or a hidden feature, should be treated as visible to a determined person.
That makes the backend the real line of defence. If your server trusts the app to enforce who may see what, anyone with a proxy can ask for another customer's data. A mobile test finds these gaps, which matters when the app handles payments or personal data.
How it shows up
Testers commonly follow the OWASP Mobile Application Security Verification Standard, MASVS, and its testing guide. Typical findings are sensitive data in insecure local storage, weak or missing certificate pinning, secrets embedded in the app and APIs that skip authorisation checks.
The mistakes repeat. Teams test only the app and ignore the API behind it. They rely on obfuscation as if it were protection. Or they test one platform and assume the other behaves the same. Include both the binary and the backend in scope, and retest after each major release.
Questions people ask
Mobile penetration testing, answered
What does a mobile pentest cover?
The app on the device, including storage, permissions and the way it handles secrets, and the backend APIs it calls. Both matter, because a flaw in either can expose user data.
Do we need to test both iOS and Android?
Usually yes. The two platforms store data differently and the apps are often built separately, so a flaw in one may not appear in the other. Test each on its own terms.
Is the API part of mobile testing?
Yes, and it is often where the serious flaws are. The server must enforce access rules itself, because the app can be bypassed. Testing the API directly is a core part of the work.
Does obfuscation protect the app?
It slows reverse engineering but does not stop it. Do not place secrets in the app and rely on hiding them. Treat obfuscation as a speed bump, and put real checks on the server.
Which standard do mobile testers follow?
Most use OWASP's MASVS, which lists what a secure app should do, and the Mobile Application Security Testing Guide, which describes how to check. They give a shared reference for reports.
Sources
Where this comes from
Related
Terms that sit next to this one
OWASP MASVS
A standard listing what a secure mobile app should do.
Insecure data storage on mobile
A phone app saving tokens or personal data where other apps or people can read it.
Certificate pinning
An app accepting only one expected certificate, so a fake one is refused.
App reverse engineering
Taking a mobile app apart to read its code, keys and hidden endpoints.
API penetration testing
A pentest aimed at your API's endpoints, auth, data access and business rules.
What does the backend still trust?
The APIs behind your mobile app are web APIs, and that is where we work. We check cross-account access and business-logic gaps, and prove each finding with the request and response. Book a pilot on one app.
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