Security guide
Is v0 Safe? Security Guide for v0-Built Apps
Vercel’s v0 differs from Lovable/Bolt/Replit in an important way: it generates UI COMPONENTS, not a full-stack app. There’s no “v0 database” to leak — which completely changes where the risk lives.
Quick answer
Because it has no built-in backend, v0 has a smaller risk surface than full-stack tools — there’s no “v0’s RLS was off” because there’s no default database. The risk concentrates in the generated frontend code, and in whatever backend you wire up yourself afterward.
What shows up most
Hardcoded API key in a component
It’s common to ask “connect to this API” and have the generated code paste the key straight into the React component, visible to anyone who inspects the page — the same pattern as other tools, just showing up in UI code instead of backend code.
Unsafe HTML rendering
`dangerouslySetInnerHTML` with no sanitization shows up when you ask to display rich content (markdown, user-supplied HTML). Left untreated, that opens the door to XSS — a malicious script running as if it were yours.
Whatever backend you connect afterward
The moment a v0 project gets Supabase, Firebase, or its own API, the universal risks kick in — RLS, exposed keys, everything that applies to any app.
Missing security headers
Since v0 usually ends up as part of a Next.js project on Vercel, security headers depend on manual configuration — they don’t ship set by default.
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