Mattermost versions 11.0.x <= 11.0.2, 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to validate user permissions when deleting comments in Boards, which allows an authenticated user with the editor role to delete comments created by other users.
Advisories
Source ID Title
Github GHSA Github GHSA GHSA-p6gj-jc38-x2m7 Mattermost fails to validate user permissions when deleting comments in Boards
Fixes

Solution

Update Mattermost to versions 11.1.0, 11.0.3, 10.12.2, 10.11.5, 10.5.13 or higher.


Workaround

No workaround given by the vendor.

References
History

Fri, 05 Dec 2025 15:30:00 +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

Tue, 02 Dec 2025 12:30:00 +0000

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

Mon, 01 Dec 2025 21:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

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


Mon, 01 Dec 2025 20:00:00 +0000

Type Values Removed Values Added
Description Mattermost versions 11.0.x <= 11.0.2, 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to validate user permissions when deleting comments in Boards, which allows an authenticated user with the editor role to delete comments created by other users.
Title Insecure Direct Object Reference in Mattermost Boards Plugin Enables Unauthorised Comment Deletion
Weaknesses CWE-863
References
Metrics cvssV3_1

{'score': 4.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Mattermost

Published:

Updated: 2025-12-01T20:02:24.869Z

Reserved: 2025-11-05T15:23:20.065Z

Link: CVE-2025-12756

cve-icon Vulnrichment

Updated: 2025-12-01T20:02:15.643Z

cve-icon NVD

Status : Analyzed

Published: 2025-12-01T20:15:49.147

Modified: 2025-12-05T15:26:22.237

Link: CVE-2025-12756

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2025-12-02T11:58:54Z

Weaknesses