Cursor isn't a host or a framework, it's the pair of hands. That means your app's security is whatever you and the model happened to write, deployed wherever you put it. The gaps are rarely in the clever parts. They're in everything nobody thought to prompt for.
Most Cursor-built web apps are Next.js or Vite and React, deployed to Vercel, Netlify or Cloudflare, with Supabase, Firebase or a hosted Postgres behind them.
What Cursor gets right
- You see every line: nothing is hidden behind a platform, so everything is fixable.
- Modern hosts give you HTTPS and sensible defaults for free.
- It's good at applying a precise fix when you hand it one, which is exactly what a vibeliq prompt is.
What Cursor apps usually ship without
- A secret key is baked into your JavaScript filesA secret imported into a client component, or given a NEXT_PUBLIC_ or VITE_ prefix to 'make it work', ships to every browser.
- No rules about which scripts can run on your siteSecurity headers live in framework or host config, a file the model never opens unless you ask.
- Browsers aren't told to always use HTTPSOften present on Vercel, often missing elsewhere.
- Your cookies are missing their safety settingsHand-rolled auth and cookies set from JavaScript commonly miss Secure and SameSite.
- Tracking cookies are set the moment someone arrivesAnalytics snippets pasted into a layout run for everyone, immediately.
- Some pages have no link to your privacy policyLanding pages and auth screens that skip the main layout lose the footer, and the privacy link with it.
- Inner pages are missing titles or image descriptionsThe homepage gets the care; inner pages keep the template's title and images without descriptions.
vibeliq checks all of these, and 31 more, from the outside: see every check.
What to review by hand
An outside scan, ours included, reads what a visitor’s browser receives. These live inside your accounts, so they need your eyes:
- Search the repo for NEXT_PUBLIC_ and VITE_ and read the list. Every one of those values is public. Anything a provider calls a secret shouldn't be there.
- Open every API route and server action the model wrote and ask one question: does it check who's calling before it reads or changes data?
- If you use Supabase or Firebase from the browser, check your database rules in the dashboard. No outside scan can see them.
- Check git history for keys that were committed and later deleted. Deleting doesn't un-leak: rotate them.
Questions people ask
Can't I just ask Cursor to make my app secure?
You can, and it helps. But it reads your code, not your live site. It can't open the deployed app in a browser and see which headers your host really sends, what loads before consent, or what ended up inside your built JavaScript.
Do the fix prompts work in Cursor?
Yes. Each one tells the model to work out your framework and host from the repo, make the change in the right file, and show you what it edited.
Does this replace a security review?
No. It covers the public surface of your site, the layer attackers, regulators and app reviewers see first. Logic inside your API routes still needs a human or a proper test.