Security Issues in Supermaven Code

Supermaven may complete security-sensitive code (cryptography, token generation, SQL construction) with patterns from its training data that are subtly insecure. It may suggest MD5 or SHA1 for hashing, weak random number generation, or string-interpolated SQL. It can also complete code that appears to validate input but actually bypasses validation

Never accept Supermaven completions for security-critical code without expert review. For cryptography, use established library patterns rather than completing from scratch. Add security linting rules (eslint-plugin-security, bandit for Python) that catch common insecure patterns regardless of how code was written

Every Supermaven 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 Supermaven pattern is adding auth to the UI but not the API, which means anyone with the endpoint URL can access data directly.

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.

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.

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.