CVE-2025-11776 MEDIUM

CVE-2025-11776: Guest user can discover archived public channels

Vendor Mattermost
Product Mattermost
Weakness CWE-863 · Incorrect authorization
Published November 14, 2025
Last update November 14, 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 <11 fail to properly restrict access to archived channel search API which allows guest users to discover archived public channels via the `/api/v4/teams/{team_id}/channels/search_archived` endpoint

Key dates

02Disclosure timeline

November 14, 2025 CVE published
November 14, 2025 Record updated