Is my Lovable app secure? What to check before launch
Lovable apps are usually a React front end on a Supabase backend. The front end can look finished while the backend lets anyone read or change data, because the browser only hides what the database still serves. These are the checks to run before real users and payments arrive.
- Updated
- October 5, 2026
- Written by
- Nitya Hoyos
- Checks
- 6, each with a fix
- You need
- A browser and a terminal
(01)Why it matters
An AI app builder writes code that makes the feature work for the person testing it. Security problems rarely show up in that test, because you are logged in as yourself and only click what the interface offers. An attacker does neither: they read your JavaScript, find the Supabase URL and anon key, and call the API directly.
Most of the serious problems in Lovable apps sit in a few places: Supabase tables without row level security, admin features protected only by hiding a button, edge functions that trust whatever user ID the browser sends, and paid APIs (AI models, email, SMS) that anyone can call in a loop on your bill. None of them are hard to fix once found.
You can run the checks below yourself with a browser’s developer tools and a terminal. Do it on a copy of the app with test data if you can. When you ask the AI to fix something, test the fix the same way, as a second user or with no login at all: the AI reports success when the feature works, not when the data is protected.
(02)The checks
Run these before launch
- 01
Row level security on every table
How to check
In Supabase, open the Security Advisor and look for tables without RLS. Then request a private table with only the anon key from your app’s code (see the Supabase RLS guide). If rows come back, they are public.
Fix
Enable RLS and write policies tied to the logged-in user. Ask the AI to write them, then test them as a second user.
- 02
Admin pages check the role on the server
How to check
Log in as a normal user and call the queries the admin page makes (copy them from the Network tab). If they return data, the admin page is only hidden, not protected.
Fix
Store roles in a table users cannot edit, and check them in RLS policies or edge functions, not only in React.
- 03
No secret keys in the browser bundle
How to check
Open the deployed site, view the JavaScript files in developer tools and search for sk_live, sk_test, service_role, and the names of other services you use.
Fix
Move secret keys into Supabase edge function secrets, call the service from the edge function, and rotate any key that was exposed.
- 04
Edge functions know who is calling
How to check
Read each edge function. If it takes a user ID or email from the request body and acts on it, any user can act as any other user.
Fix
Read the user from the JWT in the Authorization header with the Supabase client, and ignore IDs sent by the browser.
- 05
Payments are confirmed by Stripe, not the browser
How to check
Check how the app decides a user has paid. If the browser tells the database “paid” after checkout, a user can send that message without paying.
Fix
Grant access from a Stripe webhook handled in an edge function that verifies the Stripe signature.
- 06
Paid APIs have limits
How to check
Find the functions that call AI models, email or SMS. Check whether a logged-out user can call them, and whether anything stops one user calling them thousands of times.
Fix
Require login, add a per-user rate limit or daily quota, and set spending limits in the provider’s dashboard.
(03)Beyond the checklist
When to get help
If the app has several user roles, team accounts, payments or personal data, or you are about to announce it, get the backend reviewed before launch; fixing a leak after users find it costs far more.
(04)Questions
Are Lovable apps secure?
They can be. The generated code is a normal React and Supabase app, so its security depends on the same things as any app: row level security, where keys live, and server-side checks. The common problems come from those being skipped, not from Lovable itself.
Can people see my Supabase key in a Lovable app?
Yes, the anon key is always in the browser, and that is expected. It is only safe when row level security is enabled with correct policies on every table. A service role key or any secret API key in the browser is a real leak.
Do I need a security review before launching a Lovable app?
If it stores other people’s data or takes payments, a review before launch is the cheapest time to find problems. Run the checks on this page first; they catch the most common issues.
Want someone else to run these checks?
The AI-Built App Audit covers everything on this page and more, in 5 business days, with the file and line for each issue. $395 flat.