TL;DR: Cursor is an AI editor, not a hosted platform. That one fact drives every risk on this page. Lovable and Bolt at least put your app on rails they control. With Cursor, you own the deploy, the headers, the rate limits, and the database rules — and the editor writes code that runs long before it is safe. A cursor security audit checks the app you shipped, not the tool you used. Here is what to check, and how to scan your live URL free in about 30 seconds.
Cursor is the tool serious builders reach for. It sits inside your code. It edits across files. It ships features at a pace that feels unfair. That is also the problem. It will write a working payment flow at 1 a.m. Nothing in that flow will tell you the secret key just went into the public bundle.
Want the fast answer for your app? Run the free scan on your live URL first. No code access. No install. Then read on.
Cursor writes code. Nobody owns your deploy but you.
Lovable and Bolt are platforms. They host your app, and their defaults — good and bad — come with the deal. Cursor is different. It is an editor. When you ship, you pick the host, the env vars, the headers, and the database rules. Cursor gives you none of that. It gives you code that runs.
So the question is not "is Cursor secure." The question is: who set up your production environment? If the answer is "the AI did, and I hit deploy," then nobody did. That is what an audit checks.
The four gaps we find in Cursor-built apps
1. Secret keys in the client bundle
Cursor takes the shortest path to working code. A feature needs an API call. The call needs a key. The fastest version puts the key right next to the call, in frontend code. It works in the demo. It also ships that key to every visitor. Open your own site, view the page source, and search for sk_live, service_role, or your vendor key prefixes. If you can see a key, so can everyone. Our guide on finding exposed secrets in AI bundles walks through the exact steps.
The fix is always the same. Secret calls move behind a server route or edge function. The key moves to a server-side env var. Renaming the var is not a fix. If the frontend can read it, it is public.
2. Row Level Security left off
Most Cursor-built SaaS apps run on Supabase or Postgres. Cursor will build the table, the query, and the UI without ever turning on Row Level Security. With RLS off, your public anon key can read every row in every table. That is not a theory. CVE-2025-48757 showed 170+ AI-built apps exposed this exact way. Same stack, same default, same failure. And a policy of USING (true) counts as off. If you are not sure which key does what, read anon key vs service role key before launch.
3. No rate limiting anywhere
Auth routes, password resets, and API routes ship wide open. Nothing stops a bot from trying 10,000 passwords. Under load, this is one of the most common findings our scanner raises. The k6 engine reports it word for word as "No rate limiting detected under concurrent load." (k6Scanner.js:170). You can check one endpoint yourself with our free API rate limit checker.
4. Missing security headers and zero monitoring
CSP, HSTS, X-Frame-Options — headers come from your host or your server config, and Cursor writes neither. Run your domain through our security headers checker to see yours. Monitoring is the same story. Most vibe-coded apps have no error tracking at all. So the first person to find a bug in production is a user. Or an attacker.
The .cursorrules tell
Here is a Cursor detail most founders miss. Cursor projects often hold a .cursorrules file — your notes to the AI. If your deploy copies the whole project folder to a static host, that file is now live at yoursite.com/.cursorrules.
Our platform scanner probes for that path and treats it as a near-certain Cursor tell — platformFingerprintScanner.js:208 scores it at 0.93 confidence. That is how we know an app is Cursor-built without being told. Anyone else can know too. They can also read whatever project notes you put in that file. Config files do not belong in production. The same applies to .env, .git, and editor folders.
What Cursor does well
To be fair to the tool: Cursor is very good at applying a fix once you name it. Tell it "enable RLS on every table and write owner-scoped policies" and it will do it faster than most engineers. The gap: it does not offer these steps on its own. It aims at the code you asked for, not the checklist you did not know to ask about. An audit exists to produce that checklist.
The outside numbers back this up. Symbiotic Security scanned 1,072 AI-built apps and found 98% had at least one flaw, and 16% had critical issues. CMU's SusVibes study found 61% of AI-written code had at least one security flaw. Across 100 apps we scanned ourselves, the average Launch Readiness Score was 42/100. The tools are good. The defaults are not.
One compliance note before launch
Does your app have an AI feature and EU users? Then the EU AI Act's transparency rules (Article 50) apply from August 2, 2026. Users must be told they are talking to an AI. Fines for that breach run up to €15 million or 3% of global turnover. Our GDPR guide for vibe-coded apps covers the data side, and the Compliance Wing checks both.
The pre-launch checklist
- View page source on your live app. Search for key prefixes. Nothing privileged should appear.
- Enable RLS on every table. Owner-scoped policies. No
USING (true). - Rate-limit auth, reset, and API routes.
- Set security headers at the host: CSP, HSTS, X-Frame-Options, X-Content-Type-Options.
- Check
yoursite.com/.cursorrulesand/.envreturn 404. - Add error tracking so you hear about failures before users do.
- Turn off debug output and source maps in production.
- Re-scan after every fix. Fixes interact.
What an audit costs
The free scan is $0 and takes about a minute: a Launch Readiness Score out of 100 across security, reliability, performance, and monitoring. The full Launch Readiness Audit is $499 one time — a branded report with every finding, a ranked fix plan with time estimates, and a benchmark against 200+ audited apps. Want it fixed for you? Done-for-you setup starts at $1,999 and hands the work to a named CTO. Start with the scan. It tells you if you need anything more. More detail on our Cursor security audit page.
FAQ
Is Cursor safe to use?
Yes. Cursor is a mature AI code editor built on VS Code. The risk is not the editor. It is the app you ship with it: exposed keys, missing rate limits, and disabled Row Level Security all need their own check before launch.
What is a Cursor security audit?
It is a check of your live, deployed app for the gaps an AI editor leaves behind: keys readable in the browser, disabled RLS, missing rate limits, absent security headers, and no error tracking. Launch Ready Code runs it against your URL and scores it out of 100.
Why do Cursor-built apps expose API keys?
Cursor takes the shortest path to working code. When a feature needs a key, the fastest fix is a frontend call with the key inline. It works in the demo, and it ships the key to every visitor's browser. Nothing in the deploy pipeline stops it unless you add that check.
What is the .cursorrules tell?
Many Cursor projects include a .cursorrules config file. If your deploy copies the whole project folder, that file is now public at yoursite.com/.cursorrules. Our scanner probes for it and fingerprints Cursor builds from it at 0.93 confidence. Anyone else can find it the same way.
How long does a Cursor security scan take?
About 30 to 60 seconds. You give it your live URL. There is no install and no code access. You get a Launch Readiness Score out of 100 and the list of gaps to fix.
Do I need to share my source code?
No. The free scan is URL-based. It tests what is publicly exposed on your live app, which is where a real attacker starts. There is nothing to hand over and nothing to set up.
The pattern in every section here is the same one our vibe coding security guide shows for every AI tool: the code works, the defaults do not. Cursor took you 80% of the way. The last 20% is a checklist, and it starts with a scan.