FlawPilot
v0.dev scanner

v0 built the UI. What's behind it is your responsibility.

Vercel's v0 generates beautiful frontends. FlawPilot checks what's underneath: DNS, TLS, email authentication, exposed services, and security headers. Free, fast, no login.

Scan my appHow it works

Free. No account. Works on any live URL, Vercel-hosted or custom domain.

01

You prompt v0.dev

“A pricing page with three tiers and an FAQ section.”

02

v0.dev ships it

Next.jsshadcn/uiTailwindVercelLive
03

FlawPilot scans

3 findings
  • Missing DMARC on custom domain
  • No CSP header set
  • Permissive CORS on API routes
13 tools
run on every scan
Fast results
scan-to-report in minutes
No login
required: just your live URL
2 views
Founder and Developer output formats
What v0 builds, and what it doesn't

v0 gives you a polished frontend. The full security picture requires a different scan.

v0 by Vercel is a remarkable tool. Describe a component or a page, and you get production-ready React code in seconds. Deployed to Vercel, it's live before you finish your coffee.

Here's the distinction: v0 generates user interface code. The backend, API layer, DNS configuration, TLS settings, and email authentication setup exist separately and are often added quickly, sometimes by AI, often without a security review pass.

The most common security gaps in v0-powered apps aren't in the UI code. They're in the configuration layer underneath: missing DMARC records that leave your domain open to spoofing, HTTP security headers that weren't set, API endpoints with permissive CORS settings, and the occasional exposed service that was convenient during development.

FlawPilot scans the live, deployed version of your app from the outside. It doesn't read your v0-generated components. It checks what's exposed to the public internet and tells you what needs attention before someone else finds it.

What v0.dev left exposed

4
2 pillars
HighSecurity

Missing DMARC record on your custom domain

Email authentication is frequently missing on custom domains connected through Vercel's domain management. Missing DMARC leaves your domain open to spoofing.

HighSecurity

Known CVEs in Next.js, React, and your stack

Nuclei-powered checks against 50,000+ known CVE patterns. Catches known vulnerabilities in the frameworks your app exposes.

MediumInfrastructure

Storage and asset exposure

Publicly readable buckets or CDN assets, especially relevant if your v0 app connects to external storage.

HighSecurity

No Content-Security-Policy header

Vercel doesn't set CSP, HSTS, X-Frame-Options, and the rest by default. They're application-level headers that require explicit configuration v0 doesn't add.

A real scan surfaces these the way an attacker or enterprise customer would - before they do.

How it works

Three steps. One URL. Results in minutes.

One URL in, a plain-English report out. Every step is bounded and observable, so you always know where you are.

Live pipeline
01
Enter your app URL
The live URL where your app is deployed. Vercel's vercel.app subdomain or your custom domain — either works.
02
FlawPilot runs 13 tools
Security headers, TLS, DNS, email authentication, vulnerability signatures, port scanning, storage exposure, tech fingerprinting, and more, all in parallel.
03
Read your results
Scores across Security, Performance, and Infrastructure. Named findings in plain English. A shareable link you can send to customers or your team.
Done
What we scan

What FlawPilot checks on every v0-deployed app

v0 apps typically live on Vercel, which handles CDN, HTTPS termination, and serverless function hosting. Our scan checks the application layer: what your specific configuration exposes, not the Vercel platform itself.

Security Headers

Content-Security-Policy, HSTS, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, Permissions-Policy. Vercel doesn't set these by default. They're application-level headers that require explicit configuration.

Email Authentication (SPF, DMARC, DKIM)

Whether your domain is protected against email spoofing. Frequently missing on custom domains connected through Vercel's domain management.

TLS Configuration

Certificate chain, cipher suite strength, protocol version, and HTTPS enforcement. Vercel's managed TLS is good; application-level TLS behavior is still worth checking.

API Endpoint Exposure

Whether your API routes (Next.js API routes, serverless functions) are visible to the outside world in ways you didn't intend.

CORS Configuration

Cross-origin resource sharing settings. A common oversight when v0 UI components are wired to APIs added after the initial generation.

Vulnerability Signatures

Nuclei-powered checks against 50,000+ known CVE patterns. Catches known vulnerabilities in Next.js, React, and other frameworks your app exposes.

DNS and Subdomain Configuration

Subdomain takeover risk, dangling CNAME records, and DNS posture. Common issue when Vercel custom domains are configured and reconfigured.

Open Ports

Beyond 80/443. Typically minimal on Vercel, but relevant if your backend includes non-serverless components.

Storage and Asset Exposure

Publicly readable buckets or CDN assets. Especially relevant if your v0 app connects to external storage.

WAF Detection

Whether Vercel's edge functions or a third-party WAF is protecting your routes.

Technology Fingerprinting

What your app reveals about its stack through HTTP headers and response patterns.

Frontend Source Analysis

Sensitive data patterns in rendered HTML, inline scripts, and form security.

Performance and Infrastructure

Lighthouse-based checks. Core Web Vitals and infrastructure signals.

Two views, one scan

One scan. Readable by founders and developers.

Every finding is written twice. Flip the toggle on your report to read it as a founder or as the developer who'll fix it - same scan, same data, two registers.

Simple, business-friendly explanations.

Founder View

Founder view

Your Security, Performance, and Infrastructure scores with plain-English findings. "Your domain isn't protected against email spoofing" instead of "DMARC policy missing." Fix priorities tell you what to address first.

Questions about scanning v0 and Vercel-deployed apps

Vercel handles infrastructure security: DDoS protection, managed TLS, CDN configuration. Application-level security, things like HTTP security headers, email authentication, CORS policies, and what your API routes expose, is your responsibility. FlawPilot checks the application layer.

v0.dev scanner

v0 handled the UI. Take a few minutes to check the rest.

Free scan. No login. No jargon. Enter your app URL and get a plain-English security report you can act on or send to a customer.

Scan my app, free

No account required. No credit card. Results in minutes.

v0 built the UI. What's behind it is your responsibility. | FlawPilot