Security for apps built with v0
v0 generates polished React and Next.js interfaces from a prompt. What it does not generate is the security of the backend you connect it to. Start with a free snapshot of your external surface, then mind the gaps v0 leaves to you.
A great front-end is only half the app
v0 is excellent at the interface. But security mostly lives in the parts it does not produce for you: how your API decides who can see what, how secrets are handled, and whether the app ships with the standard hardening. A beautiful UI can sit on top of an API that returns anyone's data.
The outside view can’t see this
An API that returns data it shouldn't
The issue that costs the most with a v0-generated app is a backend endpoint that returns data without properly checking who is asking, so one user can read another's records. That lives in your server logic, invisible to any external scan, and is exactly what a full review tests. The free Surface Check does now flag a related mistake, an API key left in your front-end code, because it can read that directly.
What the free Surface Check covers for your v0 app
- Database access: if your app uses Supabase or Firebase, we detect it and test, read-only, whether any of your data is readable without a login.
- HTTPS and HSTS on your custom domain, so traffic can't be silently downgraded to plain HTTP.
- Security headers (Content-Security-Policy, clickjacking protection, nosniff) on your front-end.
- Your TLS certificate's health and how soon it expires.
- Cookie flags (HttpOnly, Secure, SameSite) on any session or auth cookies you set.
- Email spoofing: SPF, DKIM and DMARC on your domain, so attackers can't send email as you.
- Exposed secrets: common API keys or tokens (such as a Supabase service_role or Stripe secret key) left in the front-end code your site serves to browsers.
See your external surface in about a minute
A free, passive snapshot with an A-to-F Surface Score and every issue scored by severity and fix effort. No sign-up, and nothing is stored.
Run the free Surface Check →Frequently asked
Does v0 make my app secure?
It makes your interface. Security depends on the backend, the API rules and the deployment, which are the parts you wire up around what v0 generates.
What is the most common issue with a v0 app?
An API key exposed in client-side code, and an endpoint that returns data without a proper ownership check. Both are inside your code, so the free external check flags your public surface, then the code needs a direct review.
Does the check read my code?
No, it never reads your code. It reads what your domain shows the public internet, headers, TLS, DNS and your front-end, and if it detects a Supabase or Firebase backend it uses the public config your app ships to test, read-only, whether your data is readable without a login. Reviewing code and testing access control is what a full Secvura review does.
Is it free?
Yes, free and with no sign-up, with an A-to-F Surface Score and every issue scored by severity and fix effort.
More free checks