The hook
Securing a Supabase project requires a multi-layered approach focusing on API key management, database security, and storage permissions. [S1] Improperly configured Row Level Security (RLS) or exposed sensitive keys can lead to significant data exposure incidents. [S2] [S3]
What changed
This research consolidates core security controls for Supabase environments based on official architecture guidelines. [S1] It focuses on the transition from default development configurations to production-hardened postures, specifically regarding access control mechanisms. [S2] [S3]
Who is affected
Applications utilizing Supabase as a Backend-as-a-Service (BaaS) are affected, particularly those that handle user-specific data or private assets. [S2] Developers who include the service_role key in client-side bundles or fail to enable RLS are at high risk. [S1]
How the issue works
Supabase leverages PostgreSQL's Row Level Security to restrict data access. [S2] By default, if RLS is not enabled on a table, any user with the anon key—which is often public—can access all records. [S1] Similarly, Supabase Storage requires explicit policies to define which users or roles can perform operations on file buckets. [S3]
What an attacker gets
An attacker possessing a public API key can exploit tables missing RLS to read, modify, or delete data belonging to other users. [S1] [S2] Unauthorized access to storage buckets can lead to the exposure of private user files or the deletion of critical application assets. [S3]
How FixVibe tests for it
FixVibe's Supabase checks flag public Storage buckets, anonymous object listing and sensitive bucket names, exposed service-role keys, tables readable without row level security, and SQL migrations that create tables without RLS.
What to fix
Always enable Row Level Security on database tables and implement granular policies for authenticated users. [S2] Ensure that only the 'anon' key is used in client-side code, while the 'service_role' key remains on the server. [S1] Configure Storage Access Control to ensure that file buckets are private by default and access is granted only through defined security policies. [S3]