Supabase is secure by design, but requires proper configuration. This guide covers the essential security steps for any Supabase-powered application.
Row Level Security is the foundation of Supabase security. Enable it on every table that contains data.
ALTER TABLE profiles ENABLE ROW LEVEL SECURITY;
ALTER TABLE posts ENABLE ROW LEVEL SECURITY;Use the (select auth.uid()) pattern for better performance. Test policies with different user contexts.
CREATE POLICY "Users read own profile" ON profiles
FOR SELECT TO authenticated
USING ((select auth.uid()) = id);The service_role key bypasses RLS. Never expose it in frontend code. Use it only in server-side functions.
Database functions should check authentication. Use SECURITY DEFINER carefully.
CREATE FUNCTION get_user_data()
RETURNS json AS $$
BEGIN
IF auth.uid() IS NULL THEN
RAISE EXCEPTION 'Not authenticated';
END IF;
-- function logic
END;
$$ LANGUAGE plpgsql SECURITY DEFINER;Enable email confirmation, set password requirements, and configure rate limiting in the Supabase dashboard.
Query your database as an anonymous user to verify RLS is working. VAS does this automatically.
Avoid these common Supabase security pitfalls:
Use these tools to maintain security throughout development:
Security is an ongoing process, not a one-time checklist. After implementing these steps, use VAS to verify your Supabase app is secure before launch, and consider regular scans as you add new features.