Is Supabase secure?
Supabase is incredible. Without RLS, it's also a public read.
Supabase is secure when configured correctly — the anon key is public by design, so every client-queryable table must have Row Level Security enabled with real policies. The catastrophic mistakes: RLS left off, service-role keys in client bundles, and public storage buckets. All three are detectable in a 30-second scan.
Supabase ships the easiest auth + database + storage stack ever. The default tradeoff: your anon key is public (by design), so anything not protected by Row Level Security is readable by anyone with your URL. The good news — it's fixable in minutes if you can see what's exposed.
Get a graded security report for your Supabase app in under a minute.
Why Supabase apps are commonly at risk
- The anon key is in your JS bundle. That's normal. What's not normal is leaving tables readable from it.
- Many apps disable RLS during development and forget to re-enable it before production.
- Service-role keys sometimes get committed to the client bundle by mistake — that's catastrophic.
- Storage buckets often default to public when devs are debugging upload flows.
- Edge functions can expose internal endpoints if `verify_jwt` is off.
Top security risks in Supabase apps
Tables without Row Level Security
highEvery table queryable from the client must have RLS on. CheckVibe enumerates and verifies.
Service-role key in client bundle
highA service-role key bypasses RLS. If it's in your JS, every user has admin access to your database.
Public Storage buckets
highPublic buckets are fine for user avatars; they're catastrophic for invoices, contracts, or user uploads.
Edge functions without JWT verification
mediumAn edge function with `verify_jwt = false` is callable by anyone.
Anonymous sign-ups enabled but unmonitored
lowTrivial to spam your auth table to exhaust your free tier.
How to fix Supabase security gaps
Run `SELECT tablename FROM pg_tables WHERE NOT relrowsecurity AND schemaname = 'public';`
Any row returned is a table missing RLS. Enable it.
Grep your bundle for `service_role`
If it exists, rotate the key immediately and move all admin calls server-side.
Audit storage bucket policies
Public-read should be the rare exception. Default to authenticated-read.
Enable `verify_jwt` on every edge function unless you specifically need anonymous access
Set in `supabase/config.toml`.
How do you make a Supabase app rank in Google and AI search?
Securing the app is half the job, the other half is making it visible. AI engines (ChatGPT, Claude, Perplexity) only cite what their crawlers can read.
Your Supabase backend can't rank — your frontend rendering can
Supabase serves data, not HTML. If the frontend in front of it is a client-only SPA, AI crawlers see an empty page no matter how good the content is. Use an SSR framework (Next.js, SvelteKit, Remix) or prerender public routes.
Don't gate public content behind authenticated fetches
Content fetched client-side with the anon key after page load is invisible to crawlers. Render public content (docs, landing, blog, profiles you want indexed) server-side at request or build time.
Mind response times under crawl
AI and search crawlers time out on slow pages. Cache hot reads (Supabase has built-in caching on the data API), add indexes for queries on public pages, and serve static where possible — response time is one of the 68 signals CheckVibe's SEO scan scores.
Verify what engines can read
CheckVibe's AEO scan fetches your site as AI crawlers do and scores readability per engine, plus llms.txt, schema depth, and crawler permissions.
Deep dives: how to rank a vibe-coded SPA in AI search · AEO for vibe-coded apps · best AEO tools compared
Supabase security: related guides
FAQ
Is Supabase secure for production?
Yes, when you use it correctly. The biggest risk is leaving Row Level Security off on tables the client queries.
How do I know if my Supabase RLS is correct?
CheckVibe enumerates your tables and probes each with the anon key. If we can read data we shouldn't, we tell you.
What's the worst Supabase mistake?
Putting the service-role key in client code. It bypasses all RLS. CheckVibe scans bundles for it.