Description
Mattermost versions 10.5.x <= 10.5.5, 9.11.x <= 9.11.15, 10.8.x <= 10.8.0, 10.7.x <= 10.7.2, 10.6.x <= 10.6.5 fail to properly enforce channel member management permissions when adding participants to playbook runs. This allows authenticated users with member-level permissions to bypass system admin restrictions and add or remove users to/from private channels via the playbook run participants feature, even when the 'Manage Members' permission has been explicitly removed. This can lead to unauthorized access to sensitive channel content and allow guest users to gain channel management privileges.
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
10.5.0 to ≤ 10.5.5affected9.11.0 to ≤ 9.11.15affected10.8.0affected10.7.0 to ≤ 10.7.2affected10.6.0 to ≤ 10.6.5affected10.9.0unaffected10.5.6unaffected9.11.16unaffected10.8.1unaffected10.7.3unaffected10.6.6unaffected