Security Audit for v0 Apps
v0 generates polished Next.js and React interfaces with shadcn/ui and can scaffold full-stack features that deploy straight to Vercel. The UI is usually the easy part. We review the server actions, route handlers, and data access underneath it.
30-minute intro call · fixed-scope quote · human review, not scanner output. Read client case studies.
What we find most often in v0 apps
v0 projects are Next.js apps, so they inherit Next.js's server and client boundary. Most issues come from code that looks client-side but runs on the server, or the reverse.
Server actions without auth checks
Every server action is a public HTTP endpoint that can be called directly. If an action updates or deletes data without checking the session and ownership inside the action, anyone can call it.
Route handlers that trust the client
API route handlers generated for forms and dashboards often accept a user ID or role from the request body instead of deriving it from the authenticated session.
Secrets exposed with NEXT_PUBLIC_
Any environment variable prefixed `NEXT_PUBLIC_` is inlined into the browser bundle. Moving a key to that prefix to fix a build error makes it public.
Auth enforced only in middleware
Relying on middleware alone to protect pages and APIs is fragile. Data access should also be checked where the data is read or written.
Over-fetching into client components
Passing full database records to client components can leak fields such as emails, internal notes, or tokens that the UI never displays but the browser still receives.
Integrations added without review
Database, auth, and payment integrations added through prompts need their own configuration review, including webhook signatures and database access rules.
What a v0 security audit covers
A fixed-scope review of your v0-generated Next.js repository and Vercel configuration, delivered as a prioritized report.
Checks you can run yourself
Start here before you book anything. If any of these fail or you are not sure how to check, that is the signal to get a second pair of eyes.
- List every `NEXT_PUBLIC_` variable in your Vercel project and confirm none is a secret key.
- Open each file containing `"use server"` and confirm every action checks the session before touching data.
- Search route handlers for `userId` read from the request body and replace it with the session user.
- Inspect the page payload in dev tools and confirm sensitive fields are not sent to the browser.
- Confirm your Next.js version is current and includes the latest security patches.
Want a scored version? Take the free vibe code security check or work through the 25-point launch checklist.