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
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
Fixes

Solution

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


Workaround

No workaround given by the vendor.

References
History

Wed, 31 Dec 2025 19:00:00 +0000

Type Values Removed Values Added
First Time appeared Mattermost mattermost Server
CPEs cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
Vendors & Products Mattermost mattermost Server

Mon, 29 Dec 2025 23:15:00 +0000

Type Values Removed Values Added
First Time appeared Mattermost
Mattermost mattermost
Vendors & Products Mattermost
Mattermost mattermost

Wed, 24 Dec 2025 17:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

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


Wed, 24 Dec 2025 08:15:00 +0000

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'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Mattermost

Published:

Updated: 2025-12-24T16:35:17.618Z

Reserved: 2025-11-26T11:34:02.680Z

Link: CVE-2025-64641

cve-icon Vulnrichment

Updated: 2025-12-24T16:35:10.502Z

cve-icon NVD

Status : Analyzed

Published: 2025-12-24T08:15:46.487

Modified: 2025-12-31T18:55:29.067

Link: CVE-2025-64641

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2025-12-29T22:34:41Z

Weaknesses