CVE-2025-64641

Mattermost Jira plugin crafted action leaks Jira issue details

Published Dec 24, 2025 CVSS 3.1 · 4.1 Medium EPSS < 1% KEV · Not listed
Description
Mattermost versions 11.1.x <= 11.1.0, 11.0.x <= 11.0.5, 10.12.x <= 10.12.3, 10.11.x <= 10.11.7 fail to verify that post actions invoking /share-issue-publicly were created by the Jira plugin which allowed a malicious Mattermost user to exfiltrate Jira tickets when victim users interacted with affected posts

Remediation

Vendor Solution

Update Mattermost to versions 11.2.0, 11.1.1, 11.0.6, 10.12.4, 10.11.8 or higher.

Tracking

Sign in to view the affected projects.

Advisories

Source ID Title
Github GHSA Github GHSA GHSA-vww6-79rv-3j4x Mattermost doesn't verify that post actions invoking `/share-issue-publicly` were created by the Jira plugin
References
History
Type Values Removed Values Added
First Time appeared Mattermost mattermost Server
CPEs cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
Vendors & Products Mattermost mattermost Server
Type Values Removed Values Added
First Time appeared Mattermost
Mattermost mattermost
Vendors & Products Mattermost
Mattermost mattermost
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description Mattermost versions 11.1.x <= 11.1.0, 11.0.x <= 11.0.5, 10.12.x <= 10.12.3, 10.11.x <= 10.11.7 fail to verify that post actions invoking /share-issue-publicly were created by the Jira plugin which allowed a malicious Mattermost user to exfiltrate Jira tickets when victim users interacted with affected posts
Title Mattermost Jira plugin crafted action leaks Jira issue details
Weaknesses CWE-863
References
Metrics cvssV3_1

{'score': 4.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:N/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Mattermost
Published
Updated
Dec 24, 2025, 4:35 PM
Reserved
Nov 26, 2025, 11:34 AM
Status
Analyzed
Published
Dec 24, 2025, 8:15 AM
Modified
Oct 19, 2026, 10:10 PM