What is vibe coding and why does it need security scanning?

Vibe coding means using AI tools like Cursor, Bolt, v0, and Lovable to generate code quickly by describing what you want. While fast, AI-generated code often contains security vulnerabilities like XSS, SQL injection, exposed API keys, and missing authentication. OverMCP scans this code and fixes it automatically.

How does OverMCP scan my website?

Paste any live URL or GitHub repo link. OverMCP crawls your site, extracts all code (HTML, JS, CSS), follows source maps to find original source files, and runs 4 parallel AI analyses: security audit, SEO/AEO check, performance audit, and dependency CVE scan.

What is AEO (Answer Engine Optimization)?

AEO makes your website visible and recommendable by AI chatbots like ChatGPT, Claude, and Perplexity. OverMCP checks your AI bot permissions, generates llms.txt files, adds JSON-LD structured data, and optimizes your content for AI comprehension.

What payment methods are accepted?

OverMCP accepts crypto payments including Bitcoin, Ethereum, USDT, and many other cryptocurrencies. This keeps checkout accessible globally without requiring a credit card.

Can OverMCP automatically fix my code?

Yes. The $5 Fix tier creates a GitHub Pull Request with all security fixes applied. The $19 Deploy tier goes further — it deploys the fixed version directly to your hosting platform (Vercel, Netlify, Cloudflare Pages, or Railway) in one click.

free website vulnerability scannervulnerability scanningvibe coding securityweb securityOWASP ZAP

Free Website Vulnerability Scanner: How to Scan for Free

OverMCP Team

June 25, 2026

How to Scan a Website for Vulnerabilities for Free

TL;DR: You can scan any website for common vulnerabilities for free using tools like OWASP ZAP, Nikto, or online scanners like ImmuniWeb. For apps built with AI coding tools (vibe-coded apps), a free website vulnerability scanner can catch misconfigurations, exposed secrets, and injection flaws before launch.

Why Scanning Matters for Vibe-Coded Apps

When you build an app with Cursor, Bolt.new, or Lovable, speed is the priority. Security often takes a backseat. But attackers don't care if you used AI—they care about the same old vulnerabilities: SQL injection, XSS, insecure authentication, and exposed API keys. A free website vulnerability scanner helps you find these issues without spending a dime.

What Is a Free Website Vulnerability Scanner?

A free website vulnerability scanner is a tool that automatically checks your web application for known security weaknesses. These scanners simulate attacks (like sending malicious payloads) and report where your app is vulnerable. Some are open-source, others are free tiers of commercial products. They all aim to give you a quick security health check.

Top Free Website Vulnerability Scanners

Here are the best free options:

1. OWASP ZAP (Zed Attack Proxy)

•Type: Open-source, desktop app

•What it checks: XSS, SQL injection, CSRF, misconfigurations, and more

•How to use: Install, set your browser proxy, and click "Automated Scan"

•Best for: Full control, no limits on requests

2. Nikto

•Type: Command-line tool (open-source)

•What it checks: Outdated server software, dangerous files, misconfigurations

•How to use: Run nikto -h https://your-site.com

•Best for: Quick server-level checks

3. ImmuniWeb Free

•Type: Online (no install)

•What it checks: Basic vulnerabilities, SSL/TLS security, and tech stack detection

•How to use: Enter your URL, get a report in minutes

•Limits: Scans only a few pages, but great for a quick check

4. Detectify Free

•Type: Online (limited free tier)

•What it checks: Subdomain enumeration, common vulnerabilities

•How to use: Sign up, add your domain, run scan

•Limits: Scans once per week, but good for continuous monitoring

5. Qualys SSL Labs

•Type: Online (free)

•What it checks: SSL/TLS configuration

•How to use: Enter your domain, get a grade A–F

•Best for: Ensuring HTTPS is properly configured

Step-by-Step: Scanning with OWASP ZAP

Let's walk through scanning a simple Next.js app deployed on Vercel.

Step 1: Download and Install ZAP

•Go to zaproxy.org and download the installer for your OS.

•Install and launch ZAP. You'll see a prompt to "persist" a session—choose "No, I only want to do a quick scan."

Step 2: Configure Your Browser

•ZAP acts as a proxy. It will automatically configure your system proxy, but you can also set it manually in your browser: set HTTP/HTTPS proxy to localhost:8080.

•Install ZAP's root CA certificate to avoid HTTPS warnings:

- In ZAP: Tools > Options > Dynamic SSL Certificate > Save and then import into your browser.

Step 3: Run Automated Scan

•Click the "Automated Scan" button (a green play icon).

•Enter your target URL (e.g., https://my-vibe-coded-app.vercel.app).

•Click "Attack" and let ZAP spider and scan. This may take a few minutes.

Step 4: Review Alerts

•ZAP shows alerts in the bottom panel: High, Medium, Low, and Informational.

•Click on each alert to see the URL affected, the vulnerability description, and sometimes suggested fix.

Example Alert: XSS in Search Parameter

Alert: Cross Site Scripting (Reflected)

URL: https://my-vibe-coded-app.vercel.app/search?q=<script>alert(1)</script>

Description: The q parameter is echoed directly in the HTML response without sanitization.

Fix: Use a templating engine that auto-escapes (like React's JSX) or sanitize the input server-side.

// Vulnerable code (Node.js)
app.get('/search', (req, res) => {
  res.send(`<div>You searched for: ${req.query.q}</div>`);
});

// Fixed code
app.get('/search', (req, res) => {
  const safeQuery = sanitizeHtml(req.query.q, { allowedTags: [] });
  res.send(`<div>You searched for: ${safeQuery}</div>`);
});

Common Vulnerabilities in Vibe-Coded Apps

Based on scans of hundreds of AI-built apps, these are the most common findings:

•Exposed API keys: Hardcoded in client-side code (e.g., Firebase, Stripe, OpenAI). A scanner may not detect these directly, but you can use tools like TruffleHog to scan your repo.

•Missing security headers: No Content-Security-Policy, X-Frame-Options, etc. ZAP will flag these as informational or medium.

•Open redirects: A parameter like ?redirect= that accepts any URL. Attackers can use this for phishing.

•Insecure authentication: Weak password policies, no rate limiting, or JWT secrets hardcoded.

How to Fix Common Issues

Security Headers

In a Next.js app, you can add headers in next.config.js:

module.exports = {
  async headers() {
    return [
      {
        source: '/(.*)',
        headers: [
          { key: 'X-Frame-Options', value: 'DENY' },
          { key: 'X-Content-Type-Options', value: 'nosniff' },
          { key: 'Content-Security-Policy', value: "default-src 'self'" },
        ],
      },
    ];
  },
};

Open Redirect Prevention

Validate the redirect URL against an allowlist:

const allowedRedirects = ['/dashboard', '/profile'];
if (!allowedRedirects.includes(redirectUrl)) {
  redirectUrl = '/default';
}

Limitations of Free Scanners

Free tools are powerful but have limits:

•Scope: They may not crawl JavaScript-heavy SPAs well (ZAP's AJAX spider helps).

•Depth: They miss business logic flaws (e.g., price manipulation, privilege escalation).

•Rate: Online free tiers often limit scans per day or page count.

For deeper analysis, consider a dedicated security platform like OverMCP, which is designed specifically for apps built with AI coding tools and provides continuous monitoring.

When to Scan

•Before launch: Run a full scan to catch obvious issues.

•After each major update: Especially if you've added new routes or third-party integrations.

•Periodically: Set a monthly reminder to scan again (free tools can be run manually).

FAQ

Can a free website vulnerability scanner find all vulnerabilities?

No, free scanners typically detect common issues like XSS, SQL injection, and misconfigurations, but they may miss complex logic flaws, authentication bypasses, or zero-day vulnerabilities. For a more comprehensive assessment, combine free scanning with manual review or a paid service.

Is it legal to scan any website for vulnerabilities?

You should only scan websites you own or have explicit permission to test. Unauthorized scanning may violate laws like the Computer Fraud and Abuse Act (CFAA) in the US. Always get written consent before scanning third-party sites.

How often should I run a free vulnerability scan?

Run a scan before every major deployment and at least monthly for active projects. For apps handling sensitive data (e.g., payments, PII), consider more frequent scans or a continuous monitoring tool.