CVE-2025-10545 LOW

CVE-2025-10545: Guest user can add unauthorized team users to private channels

Vendor Mattermost
Product Mattermost
Weakness CWE-863 · Incorrect authorization
Published October 16, 2025
Last update October 16, 2025
View on NVD All CVEs

CVSS base score

3.1/10
Attack vector Network
Attack complexity High
Privileges required Low
User interaction None
Confidentiality Low
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

What the vulnerability does

01Description

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

Key dates

02Disclosure timeline

October 16, 2025 CVE published
October 16, 2025 Record updated