CVE-2025-59430
📋 TL;DR
The Mesh Connect JS SDK prior to version 3.3.2 contains a cross-site scripting (XSS) vulnerability in the createLink.openLink function due to insufficient URL protocol sanitization. This allows attackers to execute arbitrary JavaScript code within the parent page context, potentially accessing DOM, storage, session, and cookies. Any web application using vulnerable versions of the Mesh Connect JS SDK is affected.
💻 Affected Systems
- Mesh Connect JS SDK
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of user sessions, theft of sensitive data (cookies, storage), account takeover, and potential redirection to malicious sites through DOM manipulation.
Likely Case
Session hijacking, data theft from browser storage, and unauthorized actions performed within the user's authenticated session.
If Mitigated
Limited impact if proper Content Security Policy (CSP) headers are implemented and input validation is enforced elsewhere in the application.
🎯 Exploit Status
Exploitation requires the attacker to control input that reaches the vulnerable function, which could be through user-supplied URLs or parameters.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.3.2
Vendor Advisory: https://github.com/FrontFin/mesh-web-sdk/security/advisories/GHSA-vh3f-qppr-j97f
Restart Required: No
Instructions:
1. Update Mesh Connect JS SDK to version 3.3.2 or later. 2. Update package.json to specify 'mesh-connect-js-sdk': '^3.3.2'. 3. Run npm update or yarn upgrade. 4. Rebuild and redeploy your application.
🔧 Temporary Workarounds
Implement Content Security Policy
allAdd strict CSP headers to prevent execution of inline scripts and restrict script sources.
Content-Security-Policy: script-src 'self' https://trusted.cdn.com; object-src 'none';
Input Validation Sanitization
allImplement server-side validation to sanitize all user inputs before passing to the SDK functions.
🧯 If You Can't Patch
- Disable or restrict usage of the createLink.openLink function in your application code.
- Implement additional client-side input validation to reject URLs with javascript: or other dangerous protocols.
🔍 How to Verify
Check if Vulnerable:
Check your package.json or package-lock.json for mesh-connect-js-sdk version below 3.3.2.Check Version:
npm list mesh-connect-js-sdk | grep mesh-connect-js-sdkVerify Fix Applied:
Confirm the installed version is 3.3.2 or higher using npm list mesh-connect-js-sdk or checking package.json.📡 Detection & Monitoring
Log Indicators:
- Unusual iframe creation events with custom IDs
- JavaScript errors related to URL protocol handling
- Unexpected redirects to javascript: URLs
Network Indicators:
- Requests containing javascript: protocol in parameters
- Unexpected iframe source changes
SIEM Query:
source="web_logs" AND (url="*javascript:*" OR referer="*javascript:*")🔗 References
- https://github.com/FrontFin/mesh-web-sdk/blob/cf013b85ab95d64c63cbe46d6cb14695474924e7/packages/link/src/Link.ts#L441
- https://github.com/FrontFin/mesh-web-sdk/commit/7f22148516d58e21a8b7670dde927d614c0d15c2
- https://github.com/FrontFin/mesh-web-sdk/pull/124
- https://github.com/FrontFin/mesh-web-sdk/security/advisories/GHSA-vh3f-qppr-j97f
