Replit's PostgreSQL integration is convenient, but database security requires careful credential management and access control.
Replit offers built-in PostgreSQL for projects that need a relational database without Supabase's additional features.
These are the security issues we find most often in Replit apps using PostgreSQL.
PostgreSQL connection strings may be hardcoded in public Repls.
PostgreSQL RLS exists but is rarely configured in Replit projects.
Database connections may not require SSL, allowing interception.
Database user may have more permissions than needed.
Verify connection strings are in Secrets, not code.
Check that SSL is required for database connections.
Review database user permissions and RLS policies.
Check for SQL injection vulnerabilities in queries.
Apply these fixes right now to improve your security.
Move DATABASE_URL to Replit Secrets immediatelyRequire SSL: add ?sslmode=require to connection stringEnable RLS on tables: ALTER TABLE t ENABLE ROW LEVEL SECURITY;Use parameterized queries to prevent SQL injectionCreate a limited database user instead of using the adminReplit + PostgreSQL works well when credentials are properly managed. Use Secrets, enable SSL, and consider RLS for multi-tenant apps.
Find Row Level Security misconfigurations, exposed credentials, and other vulnerabilities before attackers do.
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