CVE-2025-46702: Mattermost Server

Medium severity, CVSS 5.4. EPSS: 0.2% chance of exploitation in the next 30 days.

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

• Mattermost Mattermost Server: from 9.11.0, before 9.11.16 (fixed in 9.11.16); from 10.5.0, before 10.5.6 (fixed in 10.5.6); from 10.6.0, before 10.6.6 (fixed in 10.6.6); from 10.7.0, before 10.7.3 (fixed in 10.7.3); version 10.8.0 only

Published 2025-06-30. Last modified 2026-06-17.