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The vulnerability in AuthKit React Router Library (versions before 0.7.0) exposed sensitive authentication artifacts (sealedSession and accessToken) by returning them from the authkitLoader. This caused the tokens to be rendered directly into the browser’s HTML output. Attackers could exploit this flaw through cross-site scripting (XSS), malicious browser extensions, or by inspecting local HTML source code. Once obtained, these tokens could enable session hijacking, allowing unauthorized access to user accounts. The issue stemmed from improper handling of sensitive data in the loader function, which inadvertently included authentication tokens in the DOM.
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Platform: AuthKit React Router
Version: <0.7.0
Vulnerability: Sensitive Data Exposure
Severity: High
Date: Aug 8, 2025
Prediction: Patch expected by Aug 15, 2025
What Undercode Say
Check if vulnerable version is installed npm list @workos-inc/authkit-react-router Upgrade to patched version npm install @workos-inc/[email protected] Verify fix grep -r "authkitLoader" src/
How Exploit
- XSS payload extraction
- Browser extension snooping
- HTML source inspection
Protection from this CVE
- Upgrade to v0.7.0+
- Sanitize DOM output
- Disable debug modes
Impact
- Session hijacking
- Unauthorized access
- Data compromise
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Sources:
Reported By: github.com
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