Security Issues in Lovable Code

The critical issue in Lovable apps is missing Supabase Row-Level Security. Lovable creates tables and writes data to them, but RLS policies are frequently missing or use 'true' as the check (which makes them pointless). This means anyone with your anon key (which is public by design) can read, modify, or delete any row in your database. Lovable also sometimes stores user data without proper access scoping — one user can see another user's data

Enable RLS on every table in Supabase. Write policies that scope reads and writes to the authenticated user (using auth.uid()). Test policies by trying to access data as a different user. Review Supabase Storage bucket policies. Ensure authentication redirects are restricted to your domain. Remove any service_role key references from client code

Every Lovable 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 Lovable 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.