Supabase Security Issues
The most common security vulnerabilities in Supabase applications—and how to fix them before attackers find them.
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7 Security Issues Documented
Common vulnerabilities found in Supabase applications
Critical Security Issues
Tables Without RLS
criticalTables with RLS disabled are completely open via the public API.
Full data exposure. Anyone with anon key can read everything.
Check pg_tables for relrowsecurity = false. Or query with anon key.
ALTER TABLE tablename ENABLE ROW LEVEL SECURITY; for every table.
Service Role Key in Frontend
criticalThe service_role key bypasses RLS and should never be client-side.
Complete RLS bypass. Full admin database access.
Search frontend code for the service_role key value.
Remove immediately. Rotate key in Supabase dashboard. Use only server-side.
High Severity Issues
Overly Permissive Policies
highRLS policies that grant too much access (e.g., TRUE for all operations).
Data accessible to more users than intended. Privacy violations.
Review policies: SELECT * FROM pg_policies WHERE policyname LIKE '%'
Rewrite policies with proper auth.uid() checks and ownership verification.
RPC Functions Without Auth
highDatabase functions callable by anyone, including unauthenticated users.
Bypass of RLS through function calls. Data manipulation.
Check function definitions for missing auth.uid() checks.
Add IF auth.uid() IS NULL THEN RAISE EXCEPTION at function start.
Storage Buckets Open
highStorage buckets without proper policies allow public read/write.
File theft, malicious file upload, storage abuse.
Try accessing storage URLs without authentication.
Configure storage policies in Supabase dashboard. Restrict by auth.
Medium Severity Issues
Using auth.uid() vs (select auth.uid())
mediumUsing auth.uid() directly causes RLS policy re-evaluation per row.
Performance degradation on large tables. Potential timeouts.
Supabase linter warns about this. Check policy definitions.
Replace auth.uid() with (select auth.uid()) in all policies.
Missing Password Requirements
mediumDefault auth settings allow weak passwords.
Easier brute force attacks. Compromised accounts.
Try creating account with simple password.
Configure password_min_length and requirements in auth config.
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 Supabase app for all these issues automatically. Scans from $5, instant results.
Get Starter ScanFrequently Asked Questions
What are the most common Supabase 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 Supabase applications.
How do I find security issues in my Supabase 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 Supabase security issues fixable?
Yes, nearly all Supabase 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 Supabase 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 Supabase have built-in security?
Supabase 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