Free JavaScript Vulnerability Scanner
Outdated front-end libraries are one of the most common ways sites get hacked. We load your page, fingerprint every JavaScript library, and match each version against the public Retire.js vulnerability database, surfacing the exact CVEs and the version that fixes them.
Library Fingerprinting
Detects jQuery, Angular, React, Vue, Bootstrap, Lodash, Moment and dozens more by URL, filename, content signature, and file hash.
CVE Details
Each finding links to the relevant CVEs and severity so you can judge real-world risk, powered by the community-maintained Retire.js feed.
Fix Guidance
We show the version each vulnerability was patched in, so you know exactly what to upgrade to.
Why outdated JavaScript matters
Real-world risk
- Old jQuery versions carry well-known XSS vulnerabilities
- Vulnerable libraries are trivially exploited by automated tools
- Third-party bundles often ship outdated dependencies
What you get
- Library name and detected version
- Known CVEs and highest severity
- The fixed-in version to upgrade to
- Confirmation when no vulnerable versions are present
Frequently Asked Questions About JavaScript Vulnerability Scanning
What is a JavaScript vulnerability scanner?
A JavaScript vulnerability scanner loads a web page, fingerprints the front-end libraries it uses (such as jQuery, Angular, Bootstrap, or Lodash), and matches each detected version against a database of known vulnerabilities. Our scanner uses the community-maintained Retire.js feed, so it reports the exact CVEs affecting a library version along with the release that fixes them.
How do I check if my website uses vulnerable JavaScript libraries?
Enter your URL above and run the scan. We render the page in a real browser, identify each loaded script by its URL, filename, content signature, and file hash, then compare the version against known vulnerability ranges. Any library with a known issue is listed with its severity, CVE references, and the version you should upgrade to.
Which JavaScript libraries does the scanner detect?
It covers the libraries tracked by the Retire.js database, including jQuery, jQuery UI, Angular, AngularJS, React, Vue, Bootstrap, Lodash, Moment.js, Handlebars, Dojo, and dozens more. Detection works on both minified and source files, and on libraries loaded from a CDN or bundled into your own JavaScript.
Why are outdated JavaScript libraries a security risk?
Known vulnerabilities are publicly documented with CVE identifiers and proof-of-concept exploits, which makes them easy targets for automated attacks. Older versions of popular libraries like jQuery carry well-known cross-site scripting (XSS) flaws, and third-party bundles often ship outdated dependencies without the site owner realizing it.
Is the JavaScript vulnerability scanner free?
Yes. The scanner is completely free with no registration required. For broader coverage that also checks Subresource Integrity, exposed secrets, card skimmers, security headers, SSL/TLS, and more, run a full ScanTower scan using the link below.
Want the Complete Picture?
FREEThis JavaScript Vulnerability Scan is great for a quick check, but our Full Security Scan gives you a comprehensive security audit in one go.