Mattermost versions 10.5.x <= 10.5.10, 10.11.x <= 10.11.2 fail to properly validate guest user permissions when adding channel members which allows guest users to add any team members to their private channels via the `/api/v4/channels/{channel_id}/members` endpoint
Advisories
Source ID Title
Github GHSA Github GHSA GHSA-424h-xj87-m937 Mattermost has an Incorrect Authorization vulnerability
Fixes

Solution

Update Mattermost to versions 10.12.0, 10.5.11, 10.11.3 or higher.


Workaround

No workaround given by the vendor.

References
History

Tue, 21 Oct 2025 18:15:00 +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, 20 Oct 2025 13:30:00 +0000

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

Thu, 16 Oct 2025 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

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


Thu, 16 Oct 2025 08:30:00 +0000

Type Values Removed Values Added
Description Mattermost versions 10.5.x <= 10.5.10, 10.11.x <= 10.11.2 fail to properly validate guest user permissions when adding channel members which allows guest users to add any team members to their private channels via the `/api/v4/channels/{channel_id}/members` endpoint
Title Guest user can add unauthorized team users to private channels
Weaknesses CWE-863
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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: Mattermost

Published:

Updated: 2025-10-16T14:14:09.887Z

Reserved: 2025-09-16T08:41:00.850Z

Link: CVE-2025-10545

cve-icon Vulnrichment

Updated: 2025-10-16T14:13:35.600Z

cve-icon NVD

Status : Analyzed

Published: 2025-10-16T09:15:33.137

Modified: 2025-10-21T18:02:51.500

Link: CVE-2025-10545

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2025-10-20T13:25:18Z