Is Supabase Safe?
Security analysis for apps built with Supabase. Open-source Firebase alternative with PostgreSQL, auth, storage, and real-time subscriptions.
Is Supabase safe? The short answer
Supabase is a safe platform: it is built on PostgreSQL, uses Postgres Row Level Security (RLS) for authorization, and its infrastructure is run by a dedicated team. But Supabase is designed so that your frontend talks to the database directly through an auto-generated API. That design is only safe if your RLS policies are correct.
This is the key difference with a classic backend: the public (anon or publishable) key shipped in your JavaScript is meant to be public. What protects your data is not that key, it is the policies on each table. A table without RLS, or with a policy that lets everyone read, is readable by anyone who opens your app's network tab. That is the most common critical issue we find in vibe-coded Supabase apps.
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Oct 5, 2026This is a scan of https://supabase.com. Your app built with Supabase may have different results.
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Scan Your Supabase AppSupabase misconfigurations we see in AI-built apps
RLS disabled on tables exposed by the API
Tables created with raw SQL or migrations do not have Row Level Security unless you enable it. With RLS off, the public key gives read and write access to the whole table through the REST API.
Policies that allow everything
Enabling RLS and then adding a policy with using (true) for every operation is the same as having no RLS. Policies must compare the row's owner with auth.uid(), separately for select, insert, update and delete.
The service_role key in the frontend
The service_role key (and the newer secret keys) bypasses RLS entirely. It must never appear in a NEXT_PUBLIC_ or VITE_ variable or in client code. Use it only in server code or Edge Functions.
Public storage buckets for private files
Files in a public bucket can be downloaded by anyone who has the URL. Invoices, ID documents or user uploads belong in a private bucket, served with signed URLs and protected by policies on storage.objects.
Views and functions that bypass RLS
A view runs with its creator's permissions by default, so it can expose rows that RLS would hide; on recent Postgres versions, create views with security_invoker = true. Functions declared security definer and callable through RPC deserve the same scrutiny.
Supabase security checklist
- Enable RLS on every table in exposed schemas and run the Security Advisor in the Supabase dashboard.
- Write one policy per operation, scoped with
auth.uid(), and test them while logged in as two different users. - Keep the
service_roleor secret key server-side only; rotate it if it was ever shipped to the browser. - Make buckets private by default and use signed URLs for sensitive files.
- Review views,
security definerfunctions and RPC endpoints.
alter table public.profiles enable row level security;
create policy "Users can read their own profile"
on public.profiles for select
to authenticated
using ((select auth.uid()) = id);Go further: How to Secure Your Supabase App in 10 Minutes
Common Security Issues in Supabase Apps
Exposed API Keys
AI coding tools often embed API keys directly in frontend JavaScript. If you're using Supabase, check that secret keys aren't in your client-side bundle.
Missing Security Headers
Headers like Content-Security-Policy, Strict-Transport-Security, and X-Frame-Options protect against XSS, clickjacking, and downgrade attacks.
Vulnerable Dependencies
Outdated npm packages with known CVEs are common in AI-generated code. Regular audits catch these before attackers do.
Authentication Weaknesses
Open registration endpoints, missing rate limiting, and exposed auth tokens are frequent issues in vibe-coded apps.
What ScanVibe Checks
Frequently Asked Questions
Is Supabase safe to use?
Supabase itself is a reputable platform, but apps built with Supabase often have security misconfigurations — exposed API keys, missing security headers, and vulnerable dependencies. ScanVibe scans your app to find these issues.
What security issues do Supabase apps commonly have?
The most common issues we find in Supabase apps are: exposed API keys in frontend JavaScript, missing security headers (CSP, HSTS), outdated dependencies with known vulnerabilities, and misconfigured authentication endpoints.
How do I check if my Supabase app is secure?
Enter your app's URL in ScanVibe's scanner. We'll check for exposed secrets, security headers, vulnerable libraries, exposed files, and platform-specific misconfigurations — all in about 30 seconds.
Does ScanVibe scan Supabase specifically?
Yes. ScanVibe detects Supabase in your stack and runs platform-specific security checks in addition to our standard 8-category analysis.
Is it safe to expose the Supabase anon key?
Yes, the anon (or publishable) key is designed to be public and ships in every Supabase frontend. It is only safe if Row Level Security is enabled with correct policies on every exposed table. The service_role key and secret keys, on the other hand, bypass RLS and must never leave your server.
How do I enable Row Level Security in Supabase?
Run alter table <table> enable row level security for each table (or use the toggle in the Table Editor), then create policies for select, insert, update and delete that compare the row owner with auth.uid(). With RLS enabled and no policy, the table is not accessible through the public API at all, which is a safe default.
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