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
References
History

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 : Awaiting Analysis

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

Modified: 2025-10-16T15:28:59.610

Link: CVE-2025-10545

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.