CVE-2025-32093
📋 TL;DR
This vulnerability allows delegated granular administration users with 'Edit Other Users' permission to modify system administrator accounts in Mattermost. Attackers could escalate privileges or compromise admin accounts. Affects Mattermost versions 10.5.x <= 10.5.1, 10.4.x <= 10.4.3, and 9.11.x <= 9.11.9.
💻 Affected Systems
- Mattermost
📦 What is this software?
Mattermost Server by Mattermost
Mattermost Server by Mattermost
Mattermost Server by Mattermost
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain full system administrator privileges, enabling complete control over the Mattermost instance, data exfiltration, and further network compromise.
Likely Case
Privilege escalation where delegated administrators gain unauthorized access to modify or disable system admin accounts.
If Mitigated
Limited impact with proper access controls and monitoring, but still represents a privilege escalation risk.
🎯 Exploit Status
Exploitation requires authenticated access with delegated admin permissions and knowledge of the vulnerability.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 10.5.2, 10.4.4, 9.11.10
Vendor Advisory: https://mattermost.com/security-updates
Restart Required: Yes
Instructions:
1. Backup your Mattermost instance. 2. Download and install the patched version from Mattermost releases. 3. Restart the Mattermost service. 4. Verify the update was successful.
🔧 Temporary Workarounds
Restrict delegated admin permissions
allTemporarily remove 'Edit Other Users' permission from delegated administrators until patching is complete.
Use Mattermost System Console > Permissions to modify user permissions
🧯 If You Can't Patch
- Review and audit all delegated administrator accounts and their permissions
- Implement strict monitoring of user modification activities in Mattermost logs
🔍 How to Verify
Check if Vulnerable:
Check Mattermost version via System Console > About Mattermost. If version is 10.5.1 or lower, 10.4.3 or lower, or 9.11.9 or lower, you are vulnerable.Check Version:
In Mattermost System Console: navigate to About Mattermost sectionVerify Fix Applied:
Verify version is 10.5.2+, 10.4.4+, or 9.11.10+ in System Console > About Mattermost.📡 Detection & Monitoring
Log Indicators:
- Unauthorized modifications to system administrator accounts by non-system admin users
- User permission changes from delegated administrators
Network Indicators:
- Unusual API calls to user modification endpoints from non-admin accounts
SIEM Query:
source="mattermost" AND (event="user_updated" OR event="permission_changed") AND actor_role!="system_admin"