Is Supabase Safe?
Supabase is safe as a platform with PostgreSQL's proven security. However, Row Level Security (RLS) misconfigurations are the leading cause of data breaches in Supabase apps.
RLS is Non-Negotiable
Supabase exposes your PostgreSQL database directly to clients via the anon key. Without RLS policies, anyone with your project URL can read, modify, or delete all data in unprotected tables.
Common Security Issues
Missing RLS Policies
Tables without RLS enabled are fully accessible to anyone with the anon key, leading to complete data exposure.
Service Role Key Leaks
The service_role key bypasses RLS. Exposing it in client code grants full database access to attackers.
Flawed RLS Policies
RLS policies with logical errors create unintended access paths. Complex policies require thorough testing.
Storage Bucket Misconfigurations
Supabase Storage also requires RLS. Public buckets may expose sensitive files.
Security Assessment
Strengths
- + PostgreSQL with enterprise-grade security
- + Row Level Security (RLS) for fine-grained access
- + Built-in authentication with JWT tokens
- + Open source - security auditable
- + SOC 2 Type II compliance
Concerns
- - RLS policies often missing or misconfigured
- - Default settings may expose data
- - Anon key in client code - RLS is essential
- - Service role key leaks grant full access
- - Complex RLS syntax leads to security gaps
The Verdict
Supabase is safe as a platform with PostgreSQL's battle-tested security. The critical factor is proper RLS configuration. Enable RLS on every table, write and test policies thoroughly, and never expose the service_role key in client code. With proper configuration, Supabase provides excellent security.
Related Resources
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