PostgreSQL Security Issues
The most common security vulnerabilities in PostgreSQL applications—and how to fix them before attackers find them.
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7 Security Issues Documented
Common vulnerabilities found in PostgreSQL applications
Critical Security Issues
Tables Without RLS
criticalRow Level Security not enabled on tables with user data.
Any authenticated user can access all data in the table.
SELECT relrowsecurity FROM pg_class WHERE relname = 'table';
ALTER TABLE tablename ENABLE ROW LEVEL SECURITY;
SQL Injection
criticalString concatenation in database queries.
Full database compromise, data theft, server control.
Search for string concatenation with user input in queries.
Use parameterized queries ($1, $2). Never concatenate.
High Severity Issues
Superuser Application Access
highApplication connecting as postgres or superuser.
Application has unlimited database privileges.
Check connection strings for postgres username.
Create limited role: CREATE ROLE app_user WITH LOGIN;
Missing SSL Requirement
highDatabase accepting unencrypted connections.
Credentials and data exposed in transit.
Check sslmode in connection string.
Require SSL: sslmode=verify-full in connection string.
Permissive pg_hba.conf
highHost-based authentication too open.
Unauthorized hosts can attempt connections.
Review pg_hba.conf for 0.0.0.0/0 entries.
Restrict to specific hosts and require SSL.
Medium Severity Issues
RLS Policy Performance
mediumUsing auth.uid() instead of (select auth.uid()).
Poor performance on large tables, potential timeouts.
Supabase linter checks for this pattern.
Replace auth.uid() with (select auth.uid()) in policies.
Missing Audit Logging
mediumNo logging of database access and changes.
Cannot detect or investigate unauthorized access.
Check if pgAudit extension is enabled.
Install and configure pgAudit for audit logging.
How to Prevent These Issues
- Run automated security scans before every deployment
- Configure database access controls (RLS/Security Rules) first
- Store all secrets in environment variables, never in code
- Enable email verification and strong password policies
- Add security headers to your hosting configuration
- Review AI-generated code for security before accepting
Find Issues Before Attackers Do
VAS scans your PostgreSQL app for all these issues automatically. Scans from $5, instant results.
Get Starter ScanFrequently Asked Questions
What are the most common PostgreSQL security issues?
The most common issues are: exposed API keys/secrets, missing database access controls (RLS or Security Rules), weak authentication configuration, and missing security headers. These account for over 80% of vulnerabilities in PostgreSQL applications.
How do I find security issues in my PostgreSQL app?
Run a VAS security scan for automated detection of common vulnerabilities. Manually check: database access controls, search code for hardcoded secrets, verify authentication settings, and test security headers. VAS catches all of these automatically.
Are PostgreSQL security issues fixable?
Yes, nearly all PostgreSQL security issues are configuration problems with straightforward fixes. Missing RLS, exposed secrets, weak auth—all have clear remediation steps. Most fixes take under an hour to implement.
How quickly can PostgreSQL security issues be exploited?
Exposed databases and API keys can be discovered within minutes using automated scanners. Attackers actively scan for common patterns. This is why security configuration must happen before deployment, not after.
Does PostgreSQL have built-in security?
PostgreSQL provides security features, but they require configuration. Security isn't automatic—you must enable database access controls, manage secrets properly, configure auth settings, and add security headers. The tools exist; you must use them.
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Last updated: January 16, 2026