Joy Foroughi
Executive Assistant
OWASP Mobile Top 10 Explained for Founders (2026 Guide)
The OWASP Mobile Top 10 is a ranked list of the ten most critical security risks in mobile apps, maintained by the OWASP Foundation. As a founder you do not need to read code to use it. You need to know the ten risks, what each can do to your users and your business, and which questions to put to the team building your app. This guide covers all three, in the order you will meet them: what the list is, the ten risks, how to build them into your process, and how to keep checking after launch.
The OWASP Mobile Top 10 is a ranked list of the ten most critical security risks in mobile apps, maintained by the OWASP Foundation. As a founder you do not need to read code to use it. You need to know the ten risks, what each can do to your users and your business, and which questions to put to the team building your app. This guide covers all three, in the order you will meet them: what the list is, the ten risks, how to build them into your process, and how to keep checking after launch.
TL;DR
The current list is the 2024 revision, the first update since 2016. It names ten risks, from M1 Improper Credential Usage to M10 Insufficient Cryptography.
Treat the list as a requirements tool. OWASP says its controls are best considered at the requirements stage, not after the build.
Most of the ten come down to a few habits: no secrets in the app, server-side checks for every sensitive action, encrypted data, and vetted third-party code.
Security is not a one-time sign-off. Test on releases that touch sensitive features, and plan for forced updates and monitoring after launch.
Ask your team to map testing to the list and to the MASVS standard, then show you the results in plain language.
What the OWASP Mobile Top 10 is, and why it differs from the web list
OWASP is a nonprofit community that publishes free security guidance. Its Mobile Top 10 was first released in 2014, updated in 2016, and revised again in 2024. According to the OWASP Developer Guide, the 2024 list was built with a data-based approach drawing on incident reports, vulnerability databases and security assessments.
You may have heard of the more famous OWASP Top 10 for web applications. The mobile list exists separately because the environment is different. As one mobile security specialist explains, mobile apps run on devices outside your control, can be downloaded and inspected by attackers straight from the app stores, use device resources such as the camera and GPS, and face platform-specific issues on iOS and Android.
That last point matters for a founder. When you ship a web app, you control the server and can fix a flaw in minutes. When you ship a mobile app, a copy of your code sits on every user's phone, and a fix only reaches users when they update.
The list also has a companion. The Mobile Top 10 is meant to complement the MASVS, the Mobile Application Security Verification Standard. Think of the Top 10 as the awareness list and the MASVS as the detailed, testable requirements.
Why founders should care before the first line of code
Security feels like an engineering concern until something goes wrong. The numbers suggest the gap between confidence and reality is wide. One research paper reports that 93% of organizations felt confident in their mobile defenses, yet 62% had at least one mobile application security incident in the year studied.
The business cost is rarely just the breach itself. It is lost user trust, app store problems, delayed roadmap work and, for apps that handle payments or health data, regulatory exposure. If you build in a regulated space, this FDA-focused cybersecurity checklist for U.S. startups shows how seriously security is treated when patient safety is involved. We also cover the startup angle in why app security is critical for startups.
The cheapest time to deal with any of this is early. Fixing a design flaw after launch means a new build, a store review and a wait for users to update.
The ten risks in plain English
Here is the 2024 list, as published in the OWASP Developer Guide, with what each means for you and the question to ask your team.
Rank | Risk | What it means in founder terms |
|---|---|---|
M1 | Improper Credential Usage | Keys or passwords are mishandled, for example embedded in the app |
M2 | Inadequate Supply Chain Security | Third-party code or vendors introduce weaknesses |
M3 | Insecure Authentication/Authorization | Login or permission checks can be bypassed |
M4 | Insufficient Input/Output Validation | The app trusts data it should check |
M5 | Insecure Communication | Data travels without proper protection |
M6 | Inadequate Privacy Controls | Personal data is exposed or over-collected |
M7 | Insufficient Binary Protections | The app can be reverse engineered or tampered with |
M8 | Security Misconfiguration | Settings and permissions are left unsafe |
M9 | Insecure Data Storage | Sensitive data sits unprotected on the device |
M10 | Insufficient Cryptography | Encryption is weak or implemented wrongly |
M1: Improper credential usage
This covers hardcoded API keys, passwords stored carelessly and credentials passed around insecurely. According to Cobalt, the consequences include data breaches, privacy compromise, fraud and takeover of administrative functionality. Credentials are a common thread in real incidents too: a Promon guide cites CISA findings that 51% of the breaches it studied involved credential-related issues.
Ask your team: Where do API keys live, and what happens if someone extracts the app file and reads it?
M2: Inadequate supply chain security
Your app is built partly from code you did not write: SDKs, libraries, analytics tools, payment kits. Risk emerges from insecure code repositories, lax coding practices or unvetted vendors. The Promon guide cites Verizon research finding that 15% of data breaches involved the software supply chain. This category is new as a standalone entry in 2024, which researchers read as a sign the field now treats supply chain risk as systemic.
Ask your team: Which third-party SDKs are in the app, who vetted them, and how do we learn when one has a known vulnerability?
M3: Insecure authentication and authorization
Authentication asks who you are. Authorization asks what you may do. Weak implementations can lead to escalated privileges, data theft, fraud and reputation damage. The OWASP Cheat Sheet Series recommends server-side authentication and authorization, so a modified app cannot simply grant itself access.
Ask your team: If a user edits the app or intercepts a request, can they reach another user's data?
M4: Insufficient input and output validation
Apps accept input from users, files, links and other apps. If that data is not checked, attackers can feed the app unexpected content. This is where injection-style flaws live. The practical rule is simple: validate on the server, and do not assume the app on the phone is the only thing talking to your backend.
Ask your team: What does our API do when it receives data the app would never send?
M5: Insecure communication
Data moving between the app and your servers must be protected in transit. The OWASP Cheat Sheet Series recommends encrypting sensitive data at rest and in transit using platform APIs. Public Wi-Fi is the classic scenario: a user logs in at a café and anyone positioned on the network can try to read unprotected traffic.
Ask your team: Is every connection encrypted, including to third-party services, and how is that verified?
M6: Inadequate privacy controls
This risk is about personal data: collecting more than you need, exposing it in logs or error messages, or sharing it without clear control. Sloppy logging is a frequent culprit, because crash reports can quietly capture names, emails or tokens. Privacy is also a trust and compliance matter for your brand, not only a technical one.
Ask your team: What personal data do we collect, why, and does any of it appear in logs or analytics?
M7: Insufficient binary protections
The binary is the compiled app. Attackers can download it and analyze or modify it, and the Zimperium specialist notes that inspection can take under 15 minutes and under $150. The Cheat Sheet Series recommends disabling debugging, obfuscating the binary and using runtime anti-tampering controls. Finance, payments and any app with valuable logic or content should take this seriously.
Ask your team: What stops someone from repackaging our app with changes and distributing it?
M8: Security misconfiguration
Default settings, excessive permissions, debug features left on and open cloud storage all fall here. These flaws are rarely clever. They are oversights, which is exactly why a release checklist and automated scans catch them.
Ask your team: What is in our pre-release checklist for permissions, debug flags and backend settings?
M9: Insecure data storage
Phones get lost, stolen and compromised. Storing passwords in plaintext in local files lets an attacker who gains device access retrieve them, which can lead to account compromise, data tampering and compliance violations. The fix is to store as little as possible and protect what remains with platform security features.
Ask your team: What sensitive data is stored on the device, and how is it protected?
M10: Insufficient cryptography
Encryption only helps if it is strong and correctly implemented. Homemade algorithms, outdated methods and poor key handling undermine it. The sensible rule is to use well-established platform cryptography rather than anything custom.
Ask your team: Are we using standard platform cryptography, and who reviewed how keys are managed?
The common roots behind the ten risks
The list looks long, but many of the risks share causes. According to Cobalt, they trace back to insecure coding practices, weak encryption and misplaced trust in client-side controls. For a founder, that reduces to four principles you can state in a kickoff meeting:
Never trust the phone. Anything on the device can be read or altered, so critical checks belong on the server.
Keep secrets out of the app. Treat any key in the binary as public.
Collect and store less. Data you never hold cannot leak.
Know what you ship. Every library and SDK is part of your attack surface.
Pro Tip: Put these four principles into your product requirements document. A requirement written at the start is cheaper than a vulnerability found at the end.
How to use the list during development, testing and launch
The Mobile Top 10 is not a checklist you complete once. Approov describes it as an initial assessment tool that signals where heightened attention is needed, with the MASVS supporting threat modeling, risk-based testing and assessment of third-party components.
Here is a practical sequence.
Requirements. Decide which of the ten risks matter most for your app. Payment, banking and apps with sensitive personal data, including messaging and streaming apps, are especially well suited to this framework.
Design. Apply secure-by-design principles such as least privilege, defense in depth and separation of concerns, as the OWASP Cheat Sheet Series recommends.
Build. Automate checks in your pipeline. Bitrise describes static analysis on every commit, checks of third-party libraries against known vulnerability databases, dynamic testing of the running app and code-signing verification.
Pre-release. Add a gate. Oversecured suggests static analysis on every pull request that touches mobile code and a mandatory pass before any build moves to staging or production.
Launch and beyond. Monitor for anomalies such as unexpected network calls or tampered binaries, as Bitrise describes, and feed lessons into the next cycle.
The shift from traditional review is about timing. Instead of one gate that blocks the release, smaller checks run throughout the workflow so vulnerabilities surface within minutes. That keeps launch dates from slipping because of a surprise security finding.
A note on MASVS: it defines testable requirements at three levels, L1 baseline, L2 defense-in-depth and R for resilience against reverse engineering. A simple consumer app might target L1. A fintech or health app should discuss L2 and R with the team.
Keeping the app secure after launch
Mobile has a delay that web does not. The OWASP Cheat Sheet Series points out that post-deployment security matters because of the gap between releasing a patch and users receiving it, caused by app store review and slow user updates. It recommends a mechanism to force an update when necessary, plus incident response planning and real-time monitoring.
For testing cadence, one guide recommends security testing on every release that touches authentication, data handling, API endpoints or third-party SDK updates, a full penetration test quarterly, and continuous dynamic scanning in the pipeline. Critical apps in fintech, healthcare or government should test every build. Treat those as a reference point and set your own cadence with your team based on the data your app handles.
A balanced toolkit combines three views, per the same guide: static analysis of code and binary, dynamic analysis of the running app, and proxy-based inspection of traffic between app and API. Ethical penetration testing adds a human who finds what scanners miss, and the Cheat Sheet Series recommends it alongside automated tests.
Brand trust is the thing at stake. This is the same logic behind website security and customer trust: customers stay with products they believe protect them. For a practical companion to this guide, see our mobile app security best practices.
A founder's pre-launch security checklist
Use this in your final review meeting. Each item maps to one or more of the ten risks.
No API keys, passwords or tokens hardcoded in the app (M1).
A written list of every third-party SDK and library, with an owner for updates (M2).
Authentication and authorization enforced on the server (M3, M4).
All network traffic encrypted (M5).
Personal data inventory, with logs and crash reports reviewed for leaks (M6).
Obfuscation and anti-tampering decided for your risk level (M7).
Debug features off, permissions minimal, backend settings reviewed (M8).
Sensitive on-device data minimized and protected (M9).
Standard platform cryptography, with key handling reviewed (M10).
A forced-update mechanism and an incident response plan ready before the first user installs.
Pro Tip: Ask your team for a one-page security summary at each milestone, written for you, not for engineers. If they can explain it plainly, they understand it.
Perspective: why security belongs with senior people
We see the same pattern when a founder comes to us after a rough launch: the security gaps were not exotic. They were decisions nobody owned, such as where a key was stored, which SDK was added in a hurry, or what the app logged.
That is why we believe the people who design and build your app should be senior, and why you should be able to talk to them directly. At TouchZen, our work is handled by senior developers and designers, not delegated to junior staff. Security questions get a straight answer from the person who made the decision, not a relayed summary.
Our view is simple. Treat the OWASP Mobile Top 10 as part of the roadmap, from market research and MVP definition through engineering and launch, and keep it alive through ongoing support. Founders who raise security at kickoff spend less time reacting later.
Build security in from kickoff with TouchZen
If you are planning a new app or hardening an existing one, security works best when it is part of scoping, design and engineering rather than a final-week audit. Our team has launched over 75 apps across industries, and you work directly with senior developers and designers from kickoff to launch.
We cover strategy, UX/UI, native and cross-platform engineering, launch and continuing support. Explore our mobile app development services, plan a lean first release with MVP development for startups, or keep the app current after release through ongoing support and growth.
FAQ
Is the OWASP Mobile Top 10 a legal requirement?
No. It is an industry guidance document, not a law or certification. Your obligations come from regulations that apply to your data and sector, such as payments or health rules. The list is a practical way to show you have addressed common risks.
Do I need to follow all ten risks for an MVP?
Yes, in the sense that each should be considered, but the depth depends on your app. A simple app with little sensitive data needs less protection than a payments app. Review the ten at the requirements stage and decide with your team which ones need the most attention first.
How is the Mobile Top 10 different from MASVS?
The Top 10 is an awareness list of the most critical risks. The MASVS is a detailed standard with testable requirements at three levels. Teams commonly map their testing to both.
How often should a mobile app be tested for security?
One published guide suggests testing every release that touches authentication, data handling, APIs or third-party SDKs, with a quarterly penetration test. Higher-risk apps may test every build. Agree a cadence with your team early.
What should I do after a vulnerability is found post-launch?
Follow your incident response plan, ship a patch and use a forced-update mechanism if the issue is serious. The OWASP Cheat Sheet Series recommends having these ready because patches reach users only as they update.
