CVE-2025-41443 MEDIUM

CVE-2025-41443: Guest user can discover active public channels

Vendor Mattermost
Product Mattermost
Weakness CWE-862 · Missing authorization
Published October 16, 2025
Last update October 29, 2025
View on NVD All CVEs

CVSS base score

4.3/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality Low
Integrity None

CVSS vector

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

What the vulnerability does

01Description

Mattermost versions 10.5.x <= 10.5.12, 10.11.x <= 10.11.2 fail to properly validate guest user permissions when accessing channel information which allows guest users to discover active public channels and their metadata via the `/api/v4/teams/{team_id}/channels/ids` endpoint

Key dates

02Disclosure timeline

October 16, 2025 CVE published
October 29, 2025 Record updated