CVE-2025-13870

Unauthorized access and subscription vulnerability in Boards

Published Dec 2, 2025 CVSS 3.1 · 3.1 Low EPSS < 1% KEV · Not listed
Description
Mattermost versions 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to validate the user permission when accessing the files and subscribing to the block in Boards, which allows an authenticated user to access other board files and was able to subscribe to the block from other boards that the user does not have access to

Remediation

Vendor Solution

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

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-58w6-w55x-6wq8 Mattermost fails to validate user permissions 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
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 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to validate the user permission when accessing the files and subscribing to the block in Boards, which allows an authenticated user to access other board files and was able to subscribe to the block from other boards that the user does not have access to
Title Unauthorized access and subscription vulnerability in Boards
Weaknesses CWE-306
References
Metrics cvssV3_1

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

Weaknesses

Sources

Status
PUBLISHED
Assigner
Mattermost
Published
Updated
Dec 2, 2025, 2:38 PM
Reserved
Dec 2, 2025, 9:10 AM
Status
Analyzed
Published
Dec 2, 2025, 10:16 AM
Modified
Oct 18, 2026, 6:10 PM