Is my Lovable app secure?

Your Lovable app can be secure, but it isn't secure by default: Lovable gives you the building blocks (a Supabase-based backend, Secrets and a built-in Security view), and whether your users' data is protected depends on how your tables, policies and keys are set up. The problems we see most often in this stack are database tables that anyone can read with the public key because Row Level Security is off or too loose, and secret API keys that have ended up in frontend code.

Run a free, read-only scan of your Lovable app to see where you stand. It takes a couple of minutes once you've proved you own the app.

How Lovable apps are usually built

Lovable builds a React frontend. The backend is either Lovable Cloud, which Lovable's docs say is built on Supabase (database, auth, storage), or a Supabase project you connect yourself.

In both cases the browser talks to the database directly using a public key. That's normal and safe only if Row Level Security (RLS) is on for every table and the policies check who owns each row. The key being visible is not the problem; what it can reach is.

Secret keys (OpenAI, Stripe secret, email providers) belong in Secrets (More → Cloud → Secrets) and should only be used from backend code: an edge function, or a server function in newer Lovable projects.

Lovable's own security tools

Lovable has a Security view (More → Security). Its docs say a Quick scan runs automatically each time you publish and covers database access rules, npm dependency issues and exposed MCP servers.

The Deep scan goes further (access control, unauthenticated endpoints, leaked secrets, payments, exposed personal data) and you normally start it yourself. Running scans is free; Lovable's docs say AI fixes beyond a small free allowance use credits.

Workspace admins can turn on Block publishing with critical issues. Lovable's docs also say these tools can't guarantee complete security, so an outside-in check and re-checking after changes are still worth doing.

Common risks in Lovable apps

Tables without Row Level Security

Tables created by SQL migrations only get RLS if the SQL turns it on. With RLS off, anyone with your public key can usually read every row. Check More → Cloud → Database → RLS policies, or run the RLS audit SQL on your own Supabase.

Policies that let everyone in

A policy with using (true) makes a table world-readable. AI fixes sometimes add one to make an empty screen show data. It's fine for a public product list, not for profiles, orders or messages.

"Signed in" treated as "allowed"

A policy that only checks the user is authenticated lets everyone who signs up read everyone's rows. Signing up is free, so this is barely better than public. Policies should compare the row's owner with auth.uid().

Secret keys in the frontend

Keys pasted into components, or stored in VITE_ variables, are shipped to every visitor. Move them to Secrets and call the API from backend code, then rotate the key.

Backend functions that don't check the caller

Each edge or server function is a public URL. If it calls a paid API (AI, email, SMS) without checking who's asking, strangers can spend your money.

Admin checks that only live in React

Hiding an admin page in the UI protects nothing: the browser can call the database directly. Admin-only data has to be enforced in RLS or backend code, never by user_metadata, which users can edit.

What SealMyApp's scan checks

Finds your Supabase project URL and public key in the live bundle, then tests which tables and storage buckets answer to that key. To prove a table is readable we fetch at most one row, keep only the table and column names, and discard the row.
Looks for a Supabase service_role / secret key, and other secret keys (Stripe, OpenAI, Anthropic, AWS and more), in your JavaScript.
Checks for publicly reachable .env files, .git folders, database dumps and source maps.
Probes common admin and API paths for responses that don't need a login, and reviews basic security headers.
Doesn't flag your public anon or publishable key as a problem on its own.

We check from the outside, the way a stranger would, and never sign in, so problems that only show up for logged-in users (one user reading another's data, for example) aren't visible to us. A clean result means our checks found nothing, not that your app is guaranteed secure.

Quick checklist

Run Lovable's Deep scan and fix everything marked Critical.
RLS is on for every table, with owner-based policies.
No using (true) policies on private data.
No secret keys in the bundle; they live in Secrets and are used from backend code.
Storage buckets for user files are private.
Backend functions check the signed-in user before doing anything costly.
Paid status is only ever written by a verified Stripe webhook.
Re-check after every big AI edit.

FAQ

Is Lovable Cloud the same as Supabase?

Lovable's docs say Lovable Cloud is built on Supabase, so the same security model applies: the public key is meant to be visible and Row Level Security decides what it can read.

Is the Supabase key I can see in my Lovable app a leak?

Not if it's the anon or publishable key; those are public by design. A service_role or sb_secret_ key in the frontend is a real leak. See is my Supabase anon key safe to expose?

Does Lovable's built-in scan replace an outside check?

Use it first; it's free and it reads your code. An outside-in scan tests what a stranger can actually reach on the live app, and re-checking regularly catches things a later AI edit re-opens.

Will a SealMyApp scan change anything in my app?

No. Every check is read-only (GET and HEAD requests within a fixed budget), and we only scan after you prove you own the app with a DNS record or a small file.

Go deeper

Sources

Lovable details were checked against the official docs on 2026-10-16. Builders change their products often, so check the current docs if something here doesn't match what you see.

One common security mistake in AI-built apps, how to fix it in your builder, and one useful tool. No spam; unsubscribe any time.