HOW TO SECURE LOVABLE - SECURITY GUIDE | VIBEEVAL

Why Security Matters for Lovable Apps

Lovable ships every project on Supabase by default. Every table you ask Lovable to create lands in Postgres with RLS off until you explicitly turn it on, and the anon key is embedded in the frontend bundle. That combination — public anon key plus tables with no policy — is the single most common breach pattern we see in AI-built apps. Disclosed in CVE-2025-48757 and many incidents since, the same default ships in new projects today unless you intervene.

Security Checklist

Run these in order before launch. Items 1–4 are the ones that lose user data on day one; the rest catch escalation and recon.

1. Enable Row Level Security on every public table

In the Supabase dashboard for your Lovable project: Database → Tables → [table] → Enable RLS. Then Authentication → Policies → New Policy and add a SELECT / INSERT / UPDATE / DELETE policy keyed on auth.uid() = user_id. Toggling RLS without adding a policy blocks all access — make sure you add at least one policy in the same session, or your app breaks. Verify with the Supabase RLS Checker.

2. Audit the bundle for leaked keys

Open your deployed Lovable URL, then DevTools → Sources → search the bundle for service_role, sk_live, sk_test, and eyJ (the JWT prefix). The Supabase anon key is fine to ship; the service_role key is not. If you find a service-role key, rotate it in Supabase Settings → API → Reset service_role secret before removing it from code. The Token Leak Checker automates this with 100+ key signatures.

3. Configure auth properly

In Supabase: Authentication → Providers → Email: enable “Confirm email” so users must verify before logging in. Authentication → Sign In / Up → Password requirements: set minimum 8 chars and require at least one number/symbol. Authentication → URL Configuration → Site URL: set to your production domain — wildcards or * here let any site complete an OAuth flow against your project.

4. Test BOLA with two accounts

Sign up as user A, create some data, copy the URL or resource ID. Log out, sign up as user B, paste the same URL. If user B sees user A’s data, your app has Broken Object-Level Authorization — the most common AI-generated CRUD bug. The fix is a server-side check on every read: if resource.user_id != auth.uid() then deny. See BOLA in AI-generated CRUD for the recurring shapes.

5. Review environment variables

Lovable exposes any variable prefixed VITE_ to the browser. Variables without that prefix stay server-side. Audit your .env and any code referencing import.meta.env — the Supabase URL and anon key belong in VITE_*, the service-role key never does.

6. Lock down CORS

Default Lovable apps don’t set CORS explicitly, which means the Supabase project’s CORS list controls cross-origin access. In Supabase → API → CORS: replace * with your actual production domain. With credentials enabled, an allow-all CORS is a credential-stuffing pivot from any phishing site. See CORS credentials misconfig.

7. Validate user inputs

Add length limits and type checks on every form. The default Lovable form posts whatever the user typed straight to the API; nothing stops a 1MB string in the name field. Server-side: in your edge function or API route, validate with Zod or equivalent before touching the DB. Client-side validation is a nice-to-have — server-side is the only thing that matters.

8. Disable verbose errors in production

Lovable preview deploys ship with stack traces visible. In your edge functions, wrap handlers so 500 errors return {"error": "Internal server error"} to the client and log the full trace server-side. Stack traces leak file paths, ORM choices, and runtime versions — every one of those raises the cost of attacking you.

9. Set security headers

In vercel.json (or your deploy config), add HSTS, CSP starting with default-src 'self', X-Frame-Options: DENY, and X-Content-Type-Options: nosniff. Lovable doesn’t add these by default. Verify with the Security Headers Checker.

10. Test auth flows end-to-end

Sign up, verify email, log in, log out, reset password, log in again — each step in a fresh incognito window. Look for: tokens still valid after logout, password reset links that don’t expire, magic links that work twice. See auth flows: magic / OTP / reset for the recurring shapes.

11. Review third-party integrations

If Lovable wired in Stripe, OpenAI, or any other service, the keys went somewhere. Confirm:

• Stripe secret key is server-only (in an edge function, not in VITE_*)
• OpenAI key is server-only (browser calls cost you money on every page load)
• All webhook endpoints verify the signature before trusting the payload — see Stripe webhook and paid-trust.

12. Test with different user roles

If you have admin / regular user / paid / unpaid roles, log in as each and try to access the others’ resources. AI-generated role checks frequently filter the UI but not the API — admin pages hidden from the menu, but the admin endpoint open to anyone with curl.

13. Check logs for sensitive data

Open Supabase Logs Explorer and search for password, email, token. AI-generated logging often dumps the entire request body, which includes credentials in transit. Strip these fields before logging.

14. Run automated security scan

Run the Vibe Code Scanner over your live URL for the AI-specific patterns the manual checks won’t catch: source maps in production, exposed Vercel deployment URLs, debug routes, and the rest of the recon-surface findings.

Common Vulnerabilities in Lovable Apps

Missing RLS Policies

Without RLS, the Supabase anon key in your bundle gives anyone read/write access to every table. The fix is one migration per table: ALTER TABLE foo ENABLE ROW LEVEL SECURITY; plus at least one policy. The bug typically ships when Lovable creates a new table mid-conversation and the founder doesn’t realize a policy is needed. See the RLS misconfiguration atlas.

Exposed service_role Key

The Supabase service-role key bypasses RLS entirely. If it lands in VITE_* (because Lovable suggested it for an admin feature) it’s now public. Rotate immediately, move to a server-side function, and route admin actions through that function with explicit auth checks.

Self-Editable Role Fields

If your profiles table has an is_admin or role column, the default Lovable update endpoint accepts arbitrary fields. A user can PATCH /profiles/{my_id} with {"is_admin": true} and become admin. Fix: an RLS UPDATE policy that excludes role-related columns, or a trigger that resets them on update.

Insecure Magic Links / Password Resets

Default Lovable auth uses Supabase magic links. Make sure: link expiry is ≤ 1 hour, single-use only (Supabase enforces this if configured), and the redirect URL is on your allowlist. A magic link that survives a logout or works twice is the bug to look for.

Related Resources

Is Lovable Safe?

In-depth security analysis of the Lovable platform.

Free Self-Audit Suite

Five free scanners covering RLS, leaked keys, headers, and more.

Vibe Coding Security Risk Guide

Full risk catalogue for AI-built apps.

Solo Founder Pre-Launch Checklist

12-step checklist before accepting your first paying user.

Automate Your Security Checks

Don’t manually verify each item. VibeEval scans your Lovable application against every category above plus the long tail (BOLA, race conditions, webhook trust, dependency CVEs) and ships fix prompts you can paste straight back into Lovable.