CVE-2025-12756

Insecure Direct Object Reference in Mattermost Boards Plugin Enables Unauthorised Comment Deletion

Published Dec 1, 2025 CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed
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.

Remediation

Vendor Solution

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

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-p6gj-jc38-x2m7 Mattermost fails to validate user permissions when deleting comments in Boards
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
Mattermost mattermost Boards
Vendors & Products Mattermost
Mattermost mattermost
Mattermost mattermost Boards
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 11.0.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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Mattermost
Published
Updated
Dec 1, 2025, 8:02 PM
Reserved
Nov 5, 2025, 3:23 PM
Status
Analyzed
Published
Dec 1, 2025, 8:15 PM
Modified
Oct 19, 2026, 1:10 PM