Mobile apps handle logins, payments, and personal data every single day, which makes them a favorite target for attackers. Mobile application penetration testing, sometimes just called a mobile app pen test, is how you find the weak spots before someone else does. Here's a walkthrough of how the test actually runs: what you hand over, what testers do with your binary, and what comes back at the end.

What Is Mobile Application Penetration Testing

Mobile application penetration testing is a controlled, authorized attempt to break into your iOS or Android app the way a real attacker would. Testers look at how the app stores data, how it talks to your servers, and whether it can be tricked into leaking information it shouldn't. The goal is to find and fix issues before your app ever ships to real users, or right after if it's already live.

One framing helps more than any tool list, and it's worth holding onto. An attacker who downloads your app owns the device it runs on. They can read its files, watch its traffic, patch its code, and run it under a debugger. Everything the app does on the phone is visible to them, and there's no setting that changes that. So a mobile pentest isn't really asking whether someone can get into the app. It's asking what they can do to your backend, your data, and your other users once they're already inside it.

Why Mobile Apps Need Regular Pen Tests

Every update to your app can introduce a new vulnerability, even if the last version tested clean. App stores also don't check for the kind of deep security issues a real penetration test uncovers, so passing App Store or Play Store review means nothing from a security standpoint. Regular pen testing catches problems that pile up quietly across releases.

Mobile also has a rollback problem that the web doesn't. Fix a web bug and every user has the fix on their next page load. Fix a mobile bug and you're waiting on store review, then on users to update, and some of them won't for months. That lag is why teams schedule testing before a major release rather than after it. You can't hotfix a phone.

What You Hand Over Before Testing Starts

Most delays in a mobile test aren't technical. They're waiting on a build. Have this ready and testing starts on day one.

• Installable builds, not store links. An IPA distributed through TestFlight or an ad hoc profile, plus an APK or AAB. Store builds are re-signed and hardened in ways that slow analysis down for no benefit.
• Two test accounts per role. Same reason as any other test: proving one user can't reach another user's data takes two users.
• The backend decision. Say whether the API behind the app is in scope. If it isn't, you're testing half the product, and most of the serious findings live on the server side.
• Environment details. Which backend the build points at, and whether it's enforcing the same authentication as production.
• Feature flags and hidden states. If half the app sits behind a flag, testers need it switched on.
• Enrollment or device management steps. If your app expects a managed device, document how to get a test device into that state.
• Known defenses. Certificate pinning, root and jailbreak detection, anti debugging. Testers will work around these to reach the app's actual logic, and everyone should agree in advance that doing so is in scope.

The Mobile App Pentest Process Explained

A typical mobile penetration test starts with reviewing how the app is built and what data it handles, followed by hands on testing of the app itself, its local storage, and its network traffic. Testers try common attack techniques like intercepting traffic, reverse engineering the app binary, and attempting to bypass login and session controls. Everything gets documented as it's found, not just at the end.

Coverage is usually structured around the OWASP Mobile Application Security Verification Standard and its companion testing guide, which split the work into storage, cryptography, authentication, network, platform interaction, code quality, resilience, and privacy. In day to day terms, the test runs in four passes.

Static analysis of the binary

The app gets unpacked and read. Testers pull strings, config files, and embedded credentials, review how it was compiled, and check which third party libraries came along for the ride. Hardcoded keys and forgotten debug endpoints usually surface here, in the first afternoon.

Dynamic testing on a rooted or jailbroken device

The app runs on a device the tester fully controls. They inspect what lands in local storage, shared preferences, the keychain or keystore, logs, the screenshots the operating system caches when you background an app, and device backups. They hook functions at runtime to see whether client side checks can be flipped, which is how you find out your server validated purchase flow is actually validated on the phone.

Network and backend testing

Traffic gets intercepted, pinning gets bypassed, and then the real work starts on the API. Every request the app makes is a request an attacker can make without the app. Testers replay, modify, and reorder those requests, and check authorization on each endpoint independently. If your backend is in scope, this stretch of a mobile test looks a lot like API penetration testing, because that's what it is.

Platform interaction and privacy

Deep links, custom URL schemes, exported activities and intents on Android, pasteboard handling, biometric prompts, push notification content, and whatever the app writes to system logs. These are the platform features that let one app on a device talk to another, and a misconfigured one lets a malicious app on the same phone reach into yours. It's the mobile equivalent of an open port.

Common Vulnerabilities Found In Mobile Apps

The most frequent issues include sensitive data stored in plain text on the device, weak or missing certificate checks that allow traffic interception, hardcoded API keys sitting inside the app code, and broken session handling that lets a login stay valid far longer than it should. Most of these are straightforward to fix once you know exactly where they are.

A few more show up constantly and don't get talked about as much. Authorization enforced in the client instead of the server, so patching the app grants the privilege. Tokens with no server side revocation, so a stolen session survives a password change. Verbose error responses that leak internal structure. And third party SDKs collecting more than your privacy policy claims, which turns into a legal problem faster than a security one.

What You Get From Our Report

Affordable Pentesting delivers a full report within about a week, written in plain language your engineering team can act on immediately, not a 100 page document full of jargon. Every finding is ranked by real world risk, and our testers hold OSCP, CEH, and CREST certifications.

In practice, each finding carries the affected platform, the exact steps to reproduce it on a test device, evidence, and a fix that names the control rather than the concept. There's an executive summary you can forward to a customer's security team, and a retest letter once the fixes land, which is the document auditors and enterprise buyers actually ask for.

Mobile Pentest Questions From Product Teams

How long does a mobile app pentest take?

A single platform app with a normal feature set usually takes about a week of testing plus a few days for reporting. Two platforms take longer than one but nowhere near double, since the backend work overlaps. Apps with payments, offline sync, or heavy device integration push that out further, and we'll say so during scoping.

Do you test iOS and Android separately?

Yes, and you should scope them separately. The codebases may share a framework, but storage, keychain versus keystore, platform permissions, and inter app communication all behave differently. Cross platform frameworks like React Native or Flutter narrow the gap without closing it, and they bring their own issues, like JavaScript bundles that are trivially readable.

Can you test without the source code?

Yes. Black box mobile testing is normal, and the binary gives up plenty on its own even when you're not sharing code. Sharing source, or at least a build with symbols, speeds up analysis and shifts hours away from reverse engineering and toward actual exploitation, so you get more depth for the same window. It's a trade, not a requirement.

Do we need to submit a new build after fixes?

For the retest, yes. Provide a build that includes the fixes, ideally with a note on what changed per finding. You don't need to ship it to the store first. A TestFlight or internal track build is fine, and testing before store submission is the whole point.

Does App Store or Play Store review catch any of this?

Barely. Store review checks policy compliance, privacy declarations, and obvious malware. It doesn't attempt to break your authorization logic or hunt for your API keys. Plenty of apps with serious findings pass review on the first try, which is exactly why passing review isn't a security signal.

Shipping The Next Build With Proof

The best time to run a mobile test is a few weeks before a release you care about, while there's still room to fix what turns up and get it through store review. The worst time is right after a customer's security team asks and you're guessing at the answer.

Got a release date in mind? Work backward from it, leave two weeks for testing and fixes, and book a pentest for that window. Scoping is one conversation, and you can start it from the quote page.