CVE-2026-2543
📋 TL;DR
This vulnerability in vichan-devel vichan allows attackers to remotely change passwords without proper verification. It affects users of vichan up to version 5.1.5 who have the password change functionality enabled. The vulnerability exists in the password change handler component.
💻 Affected Systems
- vichan-devel vichan
⚠️ 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 change administrator or user passwords, leading to account takeover and potential data manipulation or deletion.
Likely Case
Unauthorized password changes for user accounts, resulting in account lockouts or unauthorized access to user-level functionality.
If Mitigated
Limited impact if strong authentication controls and monitoring are in place to detect unusual password change activity.
🎯 Exploit Status
The vulnerability description suggests remote exploitation is possible, though specific exploit details are not publicly documented.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: No
Instructions:
No official patch available. Consider upgrading to a version above 5.1.5 if available, or implement workarounds.
🔧 Temporary Workarounds
Disable Password Change Handler
allTemporarily disable the vulnerable password change functionality
# Comment out or remove password change code in inc/mod/pages.php
# Backup the file first: cp inc/mod/pages.php inc/mod/pages.php.backup
Implement Input Validation
allAdd server-side validation for password change requests
# Add proper authentication and validation checks before processing password changes
# Example: Verify current password before allowing new password to be set
🧯 If You Can't Patch
- Implement network-level controls to restrict access to the password change endpoint
- Enable detailed logging for all password change attempts and monitor for suspicious activity
🔍 How to Verify
Check if Vulnerable:
Check if running vichan version 5.1.5 or earlier and review inc/mod/pages.php for missing password verificationCheck Version:
# Check vichan version in configuration files or admin panelVerify Fix Applied:
Verify that password change requests now require proper authentication and validation📡 Detection & Monitoring
Log Indicators:
- Multiple failed password change attempts
- Password changes without proper authentication logs
- Unusual IP addresses accessing password change endpoints
Network Indicators:
- HTTP POST requests to password change endpoints without authentication headers
- Unusual traffic patterns to /mod/pages.php
SIEM Query:
source="web_logs" AND (uri="/mod/pages.php" OR uri LIKE "%/password_change%") AND status=200 AND NOT auth_user=*