CVE-2025-6593
📋 TL;DR
This CVE describes an information disclosure vulnerability in MediaWiki's User.php file that could allow attackers to access sensitive user data. The vulnerability affects MediaWiki installations running affected versions. Organizations using vulnerable MediaWiki instances could have user information exposed.
💻 Affected Systems
- Wikimedia Foundation MediaWiki
⚠️ 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 access sensitive user information including potentially personal data, authentication details, or internal user metadata, leading to privacy violations and potential credential compromise.
Likely Case
Limited information disclosure of user metadata or configuration details that could aid in further attacks or reconnaissance.
If Mitigated
Minimal impact with proper access controls and network segmentation limiting exposure to trusted users only.
🎯 Exploit Status
CWE-200 indicates information exposure, suggesting this is an information disclosure vulnerability rather than code execution
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.39.13, 1.42.7, 1.43.2, or later versions
Vendor Advisory: https://phabricator.wikimedia.org/T396230
Restart Required: No
Instructions:
1. Backup your MediaWiki installation and database. 2. Update MediaWiki to version 1.39.13, 1.42.7, 1.43.2 or later. 3. Verify the update completed successfully. 4. Test core functionality.
🔧 Temporary Workarounds
Restrict access to MediaWiki
allLimit network access to MediaWiki instances to only trusted IP addresses or networks
# Configure firewall rules to restrict access
# Example: iptables -A INPUT -p tcp --dport 80 -s trusted_network -j ACCEPT
# Example: iptables -A INPUT -p tcp --dport 80 -j DROP
🧯 If You Can't Patch
- Implement strict network segmentation to isolate MediaWiki instances from untrusted networks
- Enable detailed logging and monitoring for suspicious access patterns to User.php or user-related functions
🔍 How to Verify
Check if Vulnerable:
Check MediaWiki version by viewing Special:Version page or examining LocalSettings.php $wgVersion variableCheck Version:
grep 'wgVersion' LocalSettings.php || cat includes/DefaultSettings.php | grep 'wgVersion'Verify Fix Applied:
Verify MediaWiki version is 1.39.13, 1.42.7, 1.43.2 or later, and check that includes/user/User.php has been updated📡 Detection & Monitoring
Log Indicators:
- Unusual access patterns to user-related functions
- Multiple failed authentication attempts followed by successful access to user data
- Requests to includes/user/User.php with unusual parameters
Network Indicators:
- Unusual traffic patterns to MediaWiki user endpoints
- Requests from unexpected IP addresses or geolocations
SIEM Query:
source="mediawiki.log" AND (uri_path="*User.php*" OR message="*user*access*") AND NOT user_agent="*bot*"