Description
Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7, 10.11.x <= 10.11.22 fail to validate channel member-management permission during playbook run creation, allowing an authenticated channel member to add an arbitrary user to a restricted channel via the run owner field.. Mattermost Advisory ID: MMSA-2026-00677
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
11.9.0 to ≤ 11.9.0affected11.8.0 to ≤ 11.8.4affected11.7.0 to ≤ 11.7.7affected10.11.0 to ≤ 10.11.22affected11.10.0unaffected11.9.1unaffected11.8.5unaffected11.7.8unaffected10.11.23unaffected