CVE-2025-14273
📋 TL;DR
This vulnerability allows unauthenticated attackers to bypass authentication in Mattermost's Jira plugin and make authenticated requests to Jira servers. Attackers can spoof user IDs and inject arbitrary issue key paths to perform unauthorized actions. Affected systems include Mattermost versions 11.1.x, 11.0.x, 10.12.x, and 10.11.x with the Jira plugin enabled.
💻 Affected Systems
- Mattermost
- Mattermost Jira Plugin
📦 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 could create, modify, or delete Jira issues, access sensitive project data, or perform administrative actions on Jira servers through the compromised Mattermost integration.
Likely Case
Unauthorized access to Jira issues and project data, potentially exposing sensitive information or allowing manipulation of issue tracking systems.
If Mitigated
Limited impact with proper network segmentation and authentication controls, but still represents an authentication bypass vulnerability.
🎯 Exploit Status
Exploitation requires crafting specific plugin payloads but does not require authentication to Mattermost.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Mattermost Jira Plugin version 4.4.1 or later
Vendor Advisory: https://mattermost.com/security-updates
Restart Required: Yes
Instructions:
1. Update Mattermost Jira plugin to version 4.4.1 or later. 2. Restart Mattermost server. 3. Verify plugin functionality post-update.
🔧 Temporary Workarounds
Disable Jira Plugin
allTemporarily disable the Jira plugin until patching is possible
mmctl plugin disable jira
Network Segmentation
allRestrict network access to Mattermost Jira plugin endpoints
🧯 If You Can't Patch
- Disable the Jira plugin immediately
- Implement strict network access controls to limit who can reach the Mattermost Jira plugin endpoints
🔍 How to Verify
Check if Vulnerable:
Check Mattermost version and Jira plugin version in System Console > About or via mmctl commandCheck Version:
mmctl versionVerify Fix Applied:
Verify Jira plugin version is 4.4.1 or higher and test Jira integration functionality📡 Detection & Monitoring
Log Indicators:
- Unusual Jira plugin activity from unauthenticated users
- Failed authentication attempts followed by successful Jira requests
- Unexpected Jira API calls from Mattermost IPs
Network Indicators:
- HTTP requests to /plugins/jira/* endpoints without proper authentication headers
- Unusual traffic patterns between Mattermost and Jira servers
SIEM Query:
source="mattermost" AND (plugin="jira" OR uri_path="/plugins/jira/*") AND (http_status=200 OR http_status=201) AND NOT (user_id=* OR auth_token=*)