Security Issues in Manus Code
Critical security vulnerabilities commonly found in Manus-generated apps. Learn what to check and how to fix them before going to production.
Security risks in Manus apps
Manus has browser and terminal access during task execution and may store credentials, API keys, or session tokens in generated files or scripts. It may generate code that grants itself or other processes broad system access to accomplish a task. Reviewing what Manus actually did is essential — the final output may not fully represent the execution path
How to fix them
Review all files Manus created or modified, not just the final deliverable. Rotate any credentials that Manus used during its session. Remove any scripts or configs that Manus created to give itself system access. Audit the generated code for security issues before deploying
Authentication and authorization
Every Manus app needs authentication — verifying who the user is — and authorization — verifying what they're allowed to do. Check that every API route and server action verifies the user's identity before processing requests. Check that users can only access their own data. A common Manus pattern is adding auth to the UI but not the API, which means anyone with the endpoint URL can access data directly.
Data validation
Never trust data coming from the client. Every form submission, URL parameter, and API request body should be validated server-side before processing. Use a schema validation library like Zod to define expected shapes and reject anything that doesn't match. This prevents injection attacks, data corruption, and unexpected crashes.
Security headers
Configure security headers to protect against common web attacks: Content-Security-Policy to prevent XSS, Strict-Transport-Security to enforce HTTPS, X-Frame-Options to prevent clickjacking, and X-Content-Type-Options to prevent MIME sniffing. Most hosting platforms let you configure these in a headers file or configuration.
When to get a professional review
If your app handles user data, processes payments, or stores sensitive information, a professional security review is essential before launch. Our security scan ($19) checks for the most critical vulnerabilities, and our full security review service provides a comprehensive assessment with remediation guidance.
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Related guides
How to Deploy Your Manus-Built App
Step-by-step guide to deploying your Manus app to production.
Common Bugs in Manus-Generated Code
The most common bugs we find in Manus apps and how to fix them.
Optimizing Manus-Generated Code for Performance
How to make your Manus app faster.
Adding Tests to Your Manus Project
How to add a testing framework to your Manus app.
Related technologies
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