Mattermost Server 10.11.x < 10.11.15 / 11.4.x < 11.4.5 / 11.5.x < 11.5.4 / 11.6.x < 11.6.1 Path Traversal (MMSA-2026-00640)

The version of Mattermost Server installed on the remote host is affected by a vulnerability as referenced in the MMSA-2026-00640 advisory. - Mattermost Server fails to check the integration URL for path traversal which allows a malicious authenticated user to call an arbitrary API via a system...