CVE-2025-25068
📋 TL;DR
Mattermost fails to enforce multi-factor authentication (MFA) on plugin endpoints, allowing authenticated attackers to bypass MFA protections via API requests to plugin-specific routes. This affects Mattermost versions 10.4.x <= 10.4.2, 10.3.x <= 10.3.3, 9.11.x <= 9.11.8, and 10.5.x <= 10.5.0.
💻 Affected Systems
- Mattermost
📦 What is this software?
Mattermost Server by Mattermost
Mattermost Server by Mattermost
Mattermost Server by Mattermost
Mattermost Server by Mattermost
⚠️ Risk & Real-World Impact
Worst Case
Attackers with valid credentials could bypass MFA entirely, gaining unauthorized access to sensitive data and performing privileged actions that should require MFA verification.
Likely Case
Authenticated users could access plugin functionality that should require MFA, potentially modifying settings, accessing restricted data, or executing plugin-specific actions without proper authentication.
If Mitigated
With proper network segmentation and strong credential policies, impact is limited to authenticated users attempting to bypass MFA on specific plugin endpoints.
🎯 Exploit Status
Requires authenticated access and knowledge of plugin endpoints. Attackers need valid credentials but can bypass MFA requirements.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Update to Mattermost versions 10.4.3, 10.3.4, 9.11.9, or 10.5.1 or later
Vendor Advisory: https://mattermost.com/security-updates
Restart Required: No
Instructions:
1. Backup your Mattermost instance. 2. Download the patched version from Mattermost downloads. 3. Follow Mattermost upgrade documentation for your deployment method. 4. Verify MFA enforcement on plugin endpoints after upgrade.
🔧 Temporary Workarounds
Disable vulnerable plugin endpoints
allTemporarily disable or restrict access to plugin endpoints until patching can be completed
Network segmentation
allRestrict network access to Mattermost plugin endpoints using firewall rules or network policies
🧯 If You Can't Patch
- Implement strict access controls and monitoring on plugin API endpoints
- Enhance credential security with strong password policies and account lockout mechanisms
🔍 How to Verify
Check if Vulnerable:
Check Mattermost version via System Console > About or run: SELECT * FROM Systems WHERE Name = 'Version'Check Version:
SELECT * FROM Systems WHERE Name = 'Version'Verify Fix Applied:
After patching, test MFA enforcement by attempting to access plugin endpoints without MFA verification📡 Detection & Monitoring
Log Indicators:
- Unauthorized access attempts to plugin endpoints without MFA verification
- API requests to plugin routes from authenticated users without MFA completion
Network Indicators:
- Unusual API traffic patterns to plugin endpoints
- Requests bypassing expected MFA workflows
SIEM Query:
source="mattermost" AND (uri_path="/plugins/*" OR uri_path="/api/v4/plugins/*") AND NOT auth_method="mfa"