CVE-2025-55301
📋 TL;DR
This vulnerability allows users to modify their account username locally through browser developer tools by editing local storage values. It affects all users of The Scratch Channel web application version 1.0, enabling unauthorized account impersonation.
💻 Affected Systems
- The Scratch Channel web client
⚠️ 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
Attackers could impersonate legitimate users, potentially gaining unauthorized access to user-specific features or performing actions under another user's identity.
Likely Case
Users could change their displayed username without proper authorization, causing confusion and potential reputation issues.
If Mitigated
With proper server-side validation, username changes would be rejected, limiting impact to visual display only.
🎯 Exploit Status
Requires user access to browser developer tools and knowledge of local storage manipulation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 1.1
Vendor Advisory: https://github.com/The-Scratch-Channel/tsc-web-client/security/advisories/GHSA-9q4f-4vjm-7gp2
Restart Required: No
Instructions:
1. Download version 1.1 from the GitHub releases page. 2. Replace existing version 1.0 files with version 1.1 files. 3. Clear browser cache and local storage for affected users.
🔧 Temporary Workarounds
Implement server-side username validation
allAdd server-side checks to validate username changes against authenticated user identity
🧯 If You Can't Patch
- Implement server-side validation for all user data operations
- Monitor for unusual username change patterns in application logs
🔍 How to Verify
Check if Vulnerable:
Open browser developer tools, navigate to Application > Local Storage, and check if username values can be modified directly.Check Version:
Check the web application's version in the source code or package.json file.Verify Fix Applied:
Attempt to modify username via local storage after patching - changes should not persist or be reflected in the application.📡 Detection & Monitoring
Log Indicators:
- Username changes without corresponding authentication events
- Multiple rapid username changes from same user
Network Indicators:
- Username modification requests without proper authentication headers
SIEM Query:
source="web_app" AND event="username_change" AND NOT auth_method="proper"