Description
Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to use consistent error responses when handling the /mute command which allows an authenticated team member to enumerate private channels they are not authorized to know about via differing error messages for nonexistent versus private channels. Mattermost Advisory ID: MMSA-2026-00588
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Mattermost Mattermost
Default version status: unaffected
11.3.0 to ≤ 11.3.0affected11.2.0 to ≤ 11.2.2affected10.11.0 to ≤ 10.11.10affected11.4.0unaffected11.3.1unaffected11.2.3unaffected10.11.11unaffected