Replit's collaborative environment is great for building with Supabase, but credential management and public Repls require extra attention.
Replit's easy deployment and Supabase's generous free tier make this a popular combo for learning and prototypes. The public nature of free Repls creates unique security challenges.
These are the security issues we find most often in Replit apps using Supabase.
Free Repls are public by default, potentially exposing Supabase service keys in source code.
Developers may hardcode credentials instead of using Replit's Secrets feature.
Like other platforms, RLS is often skipped during rapid development.
Development and production may share credentials, increasing exposure risk.
Verify no Supabase credentials are in source code (should be in Secrets).
Test all tables for proper Row Level Security configuration.
Check what's accessible without authentication.
Verify Replit Secrets are properly configured and used.
Apply these fixes right now to improve your security.
Move ALL Supabase credentials to Replit SecretsMake your Repl private if it contains any credentialsEnable RLS on all Supabase tablesUse separate Supabase projects for dev and productionSearch codebase for 'supabase' to find hardcoded valuesReplit + Supabase works well when you use Replit Secrets properly and configure RLS. Never put credentials in code - free Repls are public!
Find Row Level Security misconfigurations, exposed credentials, and other vulnerabilities before attackers do.
Start Security Scan