Built with v0?
Security scanning for v0 projects
v0 generates beautiful React components, but when you connect a backend, security gaps appear. Missing CSP headers and insecure cookie settings are the most common.
Free scan. No account required.
Common issues
Top vulnerabilities in v0 apps
These are the three most common security issues we find when scanning v0 projects.
Missing Content Security Policy headers allowing script injection
Exposed API routes without proper authentication checks
Cookies set without Secure or SameSite flags on HTTPS sites
How it works
60-second security audit
01
Paste your URL
Enter your v0 app URL. We handle the rest.
02
Get your score
10 security modules run in parallel against your live site.
03
Fix with AI prompts
Copy the fix prompts into v0 and ship secure.
10 security modules, one scan
Every scan checks security headers, SSL/TLS, exposed files, JavaScript secrets, Supabase & Firebase configs, CORS, cookies, email security, and tech detection.
Fix guides for v0
Common v0 security fixes
Missing CSP header
A missing Content-Security-Policy header lets attackers inject scripts into your site. Here is what CSP does, why you need it, and how to add it in Next.js, Vercel, and Supabase apps.
Read moreCookie missing Secure flag
Cookies without the Secure flag can be sent over HTTP, leaking session tokens to anyone on the same network. Here is how to set it.
Read moreCookie missing SameSite
SameSite controls whether cookies are sent on cross-site requests — the main defense against CSRF. Here is how to set it.
Read moreHardcoded API key in JS
Any secret in your client bundle is public. Here is how to find them, rotate them, and move the calls server-side.
Read moreCORS allows all origins
An Access-Control-Allow-Origin: * policy lets any site call your API. Sometimes that is fine, often it is a mistake. Here is how to decide and fix it.
Read moreFAQ
v0 security FAQ
- Are v0-generated components secure by default?
- v0 produces good React code, but it does not configure security headers, CSP, or cookie flags — those are deployment concerns. Add them in your Next.js config after generating components.
Scan your v0 app now
Find security issues before your users do. It takes 60 seconds and your first scan is free.