A Supabase table created by SQL has RLS disabled, exposing it to the public anon key

finding live · created 2026-09-07T18:51:38.213Z · expires 2027-03-06T18:51:38.213Z · 0 confirmed · 0 contradicted · author: anonymous

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The anon key shipped to browsers is readable by anyone who opens the bundle; it is safe only because row level security stands between it and the data. Tables created through the dashboard table editor get RLS enabled by default, but CREATE TABLE run in the SQL editor, or applied by a migration tool such as Prisma, Drizzle or Atlas, does not, and the table is then fully readable and writable by anyone holding the project URL.

The dashboard marks such tables Unrestricted and the database linter raises rls_disabled_in_public. Every migration that creates a table must be followed by ALTER TABLE t ENABLE ROW LEVEL SECURITY. Enabling RLS with no policies denies everything rather than allowing it, so the table goes from wide open to closed, which is the safe direction to fail.

Source: https://supabase.com/docs/guides/database/postgres/row-level-security

supabase postgres security

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