Every tap, swipe, and login creates another opportunity for attackers to exploit a mobile application. Although secure code is crucial, it does not ensure that undiscovered vulnerabilities won't find their way into production. Mobile app penetration testing is essential in this situation because it helps businesses find exploitable flaws before attackers do.
In this blog, we'll explore the OWASP MASVS framework, walk through a practical mobile app penetration testing checklist, and explain the key security controls every organization should verify to strengthen its mobile application security.
What Is OWASP MASVS?
OWASP MASVS (Mobile Application Security Verification Standard) is a structure that outlines the security requirements a mobile application should implement. Created by the Open Worldwide Application Security Project (OWASP), MASVS provides a uniform standard for evaluating the security of iOS and Android applications and helps development and security teams establish consistent mobile application security requirements.
MASVS defines what security controls an application should implement across areas such as storage, cryptography, authentication and authorization, network communication, platform interaction, code quality, resilience, and privacy. It does not prescribe the testing methods or tools used to verify those controls.
OWASP's current mobile security model connects MASVS controls to MASWE weaknesses and MASWE weaknesses to MASTG tests, creating a traceable path from a security requirement to a specific weakness and the technical testing guidance used to assess it.
Choosing a MAS Testing Profile
MASVS uses testing profiles to match testing depth to each app’s risk. MAS-L1 sets the baseline, and MAS-L2 and MAS-R add controls on top of it.
- Building a baseline with MAS-L1 (Essential Security): MAS-L1 covers the controls every mobile app needs. These include secure data storage, strong cryptography, encrypted network traffic, and secure authentication.
- Strengthening protection with MAS-L2 (Advanced Security): MAS-L2 adds defense-in-depth controls such as certificate pinning and enforced app updates. It suits apps that handle financial, health, or other regulated data.
- Extending defenses with MAS-R (Resilience): MAS-R adds controls against reverse engineering and tampering. These include root and jailbreak detection, code obfuscation, anti-debugging, and integrity checks.
OWASP MASVS vs. OWASP MASTG vs. OWASP MASWE: What's the Difference?
MASVS, MASWE, and MASTG work together as complementary components of OWASP's mobile application security approach. MASVS defines what the application should implement, MASWE identifies the weaknesses that can prevent those controls from being achieved, and MASTG provides the technical testing guidance used to assess those weaknesses.
| Criteria | OWASP MASVS | OWASP MASWE | OWASP MASTG |
|---|---|---|---|
| Primary Purpose | Defines the security requirements and controls that a mobile application should implement to achieve a secure baseline. | Defines the weaknesses that can cause a mobile application to fail its MASVS security requirements. | Provides technical testing guidance for assessing MASWE weaknesses and validating mobile application security. |
| Focus | Focuses on what needs to be secured, including authentication, cryptography, data storage, network communication, platform interaction, code quality, resilience, and privacy. | Focuses on what can go wrong when a MASVS control is not properly implemented or when a security weakness is present. | Focuses on how to test weaknesses associated with MASVS controls using practical testing methodologies and techniques. |
| Primary Users | Security architects, developers, DevSecOps teams, product owners, compliance teams, and organizations establishing mobile security requirements. | Security architects, developers, penetration testers, application security engineers, and security teams analyzing mobile application weaknesses. | Penetration testers, application security engineers, red teams, and security consultants conducting mobile application security assessments. |
| Role in the SDLC | Helps define security requirements during application design, development, security reviews, and release preparation. | Helps teams understand and classify weaknesses that can prevent the application from meeting defined security requirements. | Supports technical verification during security testing, validation, and post-development assessments before release. |
| Key Deliverable | A standardized set of security requirements and controls that organizations can use to assess the security posture of a mobile application. | A structured catalog of mobile application weaknesses mapped to relevant MASVS controls and connected to technical testing guidance. | A comprehensive technical testing guide containing procedures, techniques, and tools for assessing mobile application security. |
| Business Value | Establishes a consistent security baseline, strengthens secure development practices, and helps organizations align mobile applications with recognized security requirements. | Creates traceability between security requirements and specific weaknesses, helping teams understand where and why an application may fail a security control. | Enables organizations to identify and validate exploitable weaknesses, verify implemented security controls, and strengthen overall mobile application security through effective testing. |
| How It Connects | Defines the security requirement. | Identifies the weakness associated with the requirement. | Provides the technical testing approach for weaknesses. |
Common Mobile App Vulnerabilities Found During Penetration Testing
- Insecure Authentication - Attackers can more easily obtain unwanted access when authentication systems are weak, such as inadequate session management, weak password rules, or the lack of multi-factor authentication (MFA). Penetration testing verifies if user profiles and sensitive app functionality are adequately protected by authentication controls.
- Broken Authorization - Inadequate permission checks can enable users to view data or carry out actions outside their granted privileges, even in cases when authentication is properly performed. Testers evaluate how uniformly role-based access controls are applied throughout the application and its backend APIs.
- Insecure Data Storage - Sensitive data should never be kept on a device in an unsafe manner. This includes encryption keys, credentials, authentication tokens, and personally identifiable information (PII). Penetration testing for mobile apps assesses how data is kept and whether it can be retrieved from iOS or Android devices.
- Weak Cryptographic Implementation - Sensitive data may be exposed by using antiquated encryption methods, shoddy key management procedures, or poorly executed cryptography. Security testing confirms the use of robust encryption techniques to safeguard data while it is in transit and at rest.
- Insecure Network Communication - Man-in-the-middle (MITM) attacks can occur in applications that do not properly check TLS certificates or enforce encrypted communication channels. In order to find vulnerabilities in certificate validation and insecure data transmission, penetration testers examine network traffic.
- API Security Weaknesses - For data sharing and business operations, the majority of mobile applications rely on backend APIs. Every mobile app penetration test must include API security because insecure APIs can create risks including failed authentication, high data exposure, insufficient authorization, and poor input validation.
- Hardcoded Secrets - The risk of unwanted access is greatly increased when credentials, encryption keys, access tokens, or API keys are directly embedded in application code. To find accessible secrets before hackers can take advantage of them, testers use static testing and reverse engineering.
- Insufficient Runtime Protection - It is simpler to alter and reverse engineer applications that do not have runtime integrity checks, root detection, jailbreak detection, or anti-tampering methods. Penetration testing assesses how well these defenses fend off typical attack methods.
OWASP MASVS Pass and Fail Examples for Android and iOS
Every MASVS control produces a clear pass or fail result. These examples show how testers judge common controls. The L2 and R tags mark controls from those testing profiles.
| Control | Pass | Fail |
|---|---|---|
| MASVS-STORAGE-1 | The app encrypts the auth token with an Android Keystore key or stores it in the iOS Keychain. | The app saves the auth token in plain text in SharedPreferences or UserDefaults. |
| MASVS-CRYPTO-1 | The app encrypts data with AES-GCM and a unique IV for every operation. | The app uses AES in ECB mode or reuses the same IV. |
| MASVS-NETWORK-1 | The app sends all traffic over TLS 1.2 or higher with full certificate validation. | The app accepts any certificate or permits cleartext HTTP. |
| MASVS-NETWORK-2 (L2) | The app pins the public key for its own API endpoints. | The app trusts a user-installed proxy certificate and exposes its traffic. |
| MASVS-AUTH-2 | The app binds biometric unlock to a Keystore or Keychain key. | The app trusts a simple true/false biometric result that Frida can bypass. |
| MASVS-PLATFORM-1 | The app limits exported components and guards each with permissions. | An exported activity lets any app open the account screen. |
| MASVS-RESILIENCE-1 (R) | The app detects root or jailbreak and responds according to its security policy. | The app keeps running on a rooted device under Frida instrumentation. |
Our testers confirm each result on real Android and iOS devices, so every finding reflects how the app behaves in the hands of an attacker.
Mobile App Penetration Testing Methodology
While the exact approach may vary depending on the application's architecture and business requirements, the following methodology aligns with OWASP's mobile security testing guidance. MASTG provides technical testing guidance for assessing weaknesses mapped to MASVS controls.
Android vs iOS Penetration Testing: MASVS Checks by Control Group
Each MASVS control group calls for platform-specific checks. These notes show what testers verify on Android and iOS for each group.
- Securing data storage (MASVS-STORAGE): On Android, confirm the app encrypts sensitive data with Keystore-backed keys, then review backup rules and logcat output. On iOS, verify Keychain accessibility classes and the Data Protection class on each sensitive file.
- Strengthening cryptography (MASVS-CRYPTO): On Android, check that the app uses platform crypto providers and keeps keys in the Android Keystore. On iOS, check that the app uses CryptoKit or CommonCrypto and keeps keys in the Keychain or Secure Enclave.
- Enabling secure authentication (MASVS-AUTH): On Android, confirm BiometricPrompt uses a CryptoObject to unlock keys. On iOS, confirm LocalAuthentication ties Keychain access to the current biometric set.
- Enhancing network security (MASVS-NETWORK): On Android, confirm Network Security Configuration blocks cleartext traffic and defines certificate pins. On iOS, confirm strict App Transport Security settings and certificate pins in NSPinnedDomains.
- Supporting safe platform interaction (MASVS-PLATFORM): On Android, test exported components, intents, PendingIntents, and App Links verification. On iOS, test custom URL schemes, Universal Links, the pasteboard, and WKWebView configuration.
- Advancing code quality (MASVS-CODE): On Android, check the targetSdkVersion and scan Gradle dependencies for known vulnerabilities. On iOS, check the minimum iOS version and scan CocoaPods or Swift Package Manager dependencies.
- Extending resilience against tampering (MASVS-RESILIENCE): On Android, test root detection, Play Integrity API checks, and R8 obfuscation against bypass attempts. On iOS, test jailbreak detection and App Attest, and confirm the release build drops the get-task-allow entitlement.
- Preparing privacy reviews (MASVS-PRIVACY): On Android, compare requested permissions and the Play Console Data safety section with actual data use. On iOS, compare purpose strings and the privacy manifest with the app’s real behavior.
Mobile App Penetration Testing Tools by MASVS Control Group
Testers combine static analysis, runtime instrumentation, and traffic interception to verify each MASVS control. The table maps common tools to the control groups they help assess.
| MASVS Group | Testing Focus | Tools |
|---|---|---|
| STORAGE | Inspect local files, databases, logs, and backups for sensitive data. | MobSF, Objection, Frida |
| CRYPTO | Find hardcoded keys and weak algorithms; trace cryptographic calls at runtime. | JADX (Android), Ghidra, Frida |
| AUTH | Test login, session, token, and biometric flows, including local authentication bypass. | Burp Suite Professional, Frida, Objection |
| NETWORK | Intercept traffic, test TLS settings, and bypass certificate pinning. | Burp Suite Professional, Frida, Objection |
| PLATFORM | Review exported components, intents, deep links, and WebViews. | APKTool (Android), JADX (Android), MobSF, Objection |
| CODE | Scan code and dependencies for known vulnerabilities and injection flaws. | MobSF, Semgrep, Ghidra |
| RESILIENCE | Test root and jailbreak detection, anti-debugging, obfuscation, and tamper checks. | Frida, Objection, APKTool (Android), Ghidra |
| PRIVACY | Trace personal data flows to backend APIs and third-party SDKs. | Burp Suite Professional, Frida |
| All Groups | Automate MASVS-aligned scanning across releases. | NowSecure, Appknox |
Our testers pair these tools with manual analysis, so every finding reflects real attacker behavior.
Mobile App Penetration Testing Checklist
Vulnerability scanning is only one aspect of a comprehensive mobile application security assessment. The checklist below organizes the assessment around OWASP MASVS controls and connects each control to its associated MASWE weaknesses and MASTG testing guidance. This structure helps teams understand exactly which security requirements are being assessed, what weaknesses may affect them, and where technical testing should provide supporting evidence.
| MASVS Group | What to Check | MASWE | Key MASTG Tests (Android, iOS) |
|---|---|---|---|
| STORAGE | Encrypt sensitive data at rest; use Keystore (Android) and Keychain (iOS); secure caches, files, and preferences; keep logs and backups free of sensitive data. | MASWE-0001 to 0006 | MASTG-TEST-0001, MASTG-TEST-0052 |
| CRYPTO | Use strong, modern algorithms; retire deprecated algorithms and protocols; secure key generation, storage, and lifecycle; manage certificates properly. | MASWE-0007 to 0017 | MASTG-TEST-0221, MASTG-TEST-0213 |
| AUTH | Enforce MFA and strong passwords; secure login and account recovery; add brute-force protection; enforce session timeouts and secure tokens; apply RBAC with server-side and object-level authorization; block privilege escalation; protect admin and sensitive actions; authenticate and authorize every API request. | MASWE-0018 to 0025 | MASTG-TEST-0018, MASTG-TEST-0064 |
| NETWORK | Enforce TLS 1.2 or 1.3; validate SSL/TLS certificates; implement certificate pinning; send all traffic over HTTPS; secure WebSocket and API traffic. | MASWE-0026 to 0028 | MASTG-TEST-0235, MASTG-TEST-0068 |
| PLATFORM | Review app permissions; check exported components; secure deep links and WebViews; follow platform security best practices. | MASWE-0029 to 0040 | MASTG-TEST-0028, MASTG-TEST-0076 |
| CODE | Inventory all SDKs and libraries; maintain an SBOM; keep dependencies current and scan for known vulnerabilities; assess third-party data handling; validate and sanitize all input. | MASWE-0041 to 0050 | MASTG-TEST-0272, MASTG-TEST-0025 |
| RESILIENCE | Detect root (Android) and jailbreak (iOS); add anti-tampering and anti-hooking; verify runtime and binary integrity; block dynamic instrumentation; obfuscate and shrink code; protect sensitive strings; add anti-debugging; harden native libraries; disable debug logs in production. | MASWE-0051 to 0065 | MASTG-TEST-0045, MASTG-TEST-0088 |
| PRIVACY | Encrypt PII; collect only necessary data; manage user consent; validate privacy settings; delete user data securely. | MASWE-0066 to 0078 | MASTG-TEST-0254, MASTG-TEST-0281 |
Compliance Frameworks That Reference Mobile Security
Mobile app penetration testing produces evidence for compliance programs. It supports PCI DSS v4.0.1, HIPAA, GDPR, SOC 2, ISO/IEC 27001:2022, and NIST CSF 2.0. MASVS gives that evidence a consistent structure, so auditors can trace each finding to a specific control. Our mobile application penetration testing guide explains how PCI DSS, HIPAA, and other frameworks apply to mobile apps.
Moving Ahead
Penetration testing for mobile apps is now more than simply a security best practice; it's an essential step in safeguarding private information, preserving user confidence, and lowering corporate risk. Organizations should routinely assess their apps against reputable security requirements such as OWASP MASVS and use the associated MASWE weaknesses and MASTG testing guidance to support technical validation. A structured evaluation approach can help find security flaws before attackers do, whether you're analyzing an existing application or getting ready for a new release.
