Free Website Security Scanner

The web is more hostile than most developers realise. According to Verizon's 2025 Data Breach Investigations Report, over 60% of web application compromises exploit issues that a basic scanner would catch in seconds: missing Content-Security-Policy, cookies without Secure or HttpOnly flags, leaked server versions, weak TLS configurations, CORS headers that trust every origin.

A free website security scanner gives you a baseline. It will not replace a full penetration test, but it will tell you — in 30 seconds — whether your site is making the mistakes that 73% of production websites make today. ScanMyVibe was built specifically to close that gap for solo developers, indie hackers and small teams who ship faster than they audit.

You do not need to install anything, sign up, or hand over a credit card. Paste your URL, press Scan, and read the report. That's the whole flow. Every finding comes with a severity, an explanation, and an AI-ready fix prompt you can paste into Cursor, Claude, or GitHub Copilot.

We run every check a paid tool like Qualys SSL Labs, Mozilla Observatory or SecurityHeaders.com would run — but consolidated into a single scan:

• → HTTP security headers — Content-Security-Policy, Strict-Transport-Security, X-Frame-Options, Referrer-Policy, Permissions-Policy, X-Content-Type-Options.
• → SSL/TLS configuration — certificate validity, chain trust, protocol versions, weak ciphers, HSTS preload eligibility.
• → Cookie security — Secure flag, HttpOnly flag, SameSite attribute, cookie prefixes, session cookie hygiene.
• → CORS configuration — wildcard origins with credentials, reflected origins, missing Vary: Origin.
• → Information disclosure — Server, X-Powered-By, X-AspNet-Version headers, verbose error pages, exposed .git or .env.
• → Known vulnerabilities — outdated jQuery, vulnerable WordPress plugins, Log4Shell fingerprints, unpatched nginx.
• → Clickjacking and XSS vectors — missing frame ancestors, inline scripts without nonces, unsafe-eval CSP.

Each finding is mapped to a CWE or OWASP Top 10 category so you can explain it to your team or your client. Critical issues float to the top — noise is filtered automatically.

ScanMyVibe is non-intrusive. We do not brute-force logins, send malicious payloads, or attempt exploitation. The scanner makes a handful of normal HTTP requests — exactly like a browser visiting your site — and analyses the responses.

That means you can safely scan sites you do not own, staging environments, and production. The scan itself takes 12–30 seconds depending on response latency and the number of checks enabled. We batch requests with intelligent concurrency so we finish fast without stressing your origin.

Under the hood we use a three-stage pipeline: a crawl-and-fetch stage that collects headers, redirects, and the final DOM; a rule engine that evaluates 100+ security rules against the collected data; and an AI layer that writes copy-paste fixes tuned to your framework (Next.js, Express, nginx, Cloudflare Workers).

Commercial security scanners like Qualys SSL Labs, Mozilla Observatory, SecurityHeaders.com, Snyk and Detectify are excellent — but each is narrow. SSL Labs only grades TLS. Observatory only grades headers. Snyk focuses on dependencies. A real security posture requires all of them, plus cookies, CORS and information disclosure.

ScanMyVibe is the only free tool that combines every category into a single scan and grade. For teams that need scheduled scans, integrations, and historical reports, our paid tiers start at $9/month — but the free scan has no hidden limits for manual use.

Curious how we compare head-to-head? Read our detailed breakdown of ScanMyVibe vs Snyk and the state of free security tooling in our guide to the best website security scanners in 2026.

Don't panic if your first report is red. Most sites fail their first scan — even sites run by professional teams. Focus on the critical and high findings first, then tackle medium. Low findings are usually informational.

1. Patch critical findings today. Missing HSTS or CSP, exposed .env files, TLS 1.0 — these take minutes to fix and block the easiest attacks.
2. Copy the AI fix prompt. Paste it into Cursor or Claude. Most fixes are a single header or one line of middleware.
3. Re-scan after deploy. Verify the finding is resolved. Every scan is live.
4. Generate a CSP. Use our CSP header generator to build a policy that matches your real traffic.
5. Schedule monthly scans. Security drifts. Upgrade if you want scheduled scans and Slack alerts.

Solo developers shipping side projects on Vercel. Indie hackers launching Next.js SaaS products. Agencies auditing client sites before launch. DevOps engineers validating staging environments. Security consultants running a quick baseline before a deeper engagement.

The common thread: people who ship fast and want a way to verify basic security without adopting a heavyweight enterprise tool. If that sounds like you, the free scanner is built for you — and it will stay free. For a deeper dive, read our guide on how to secure a website or see our list of the best free vulnerability scanners.