CVE-2026-3117: Mattermost Plugins versions <=11.5 11.1.5 10.13.11 11.3.4.0 fail to properly check for permissions when processing commands in the Gitlab plugin which allows…

medium6.5CVSS 3.1

AVNACLPRLUINSUCNINAH

Mattermost Plugins versions <=11.5 11.1.5 10.13.11 11.3.4.0 fail to properly check for permissions when processing commands in the Gitlab plugin which allows normal users to uninstall instances or setup webhook connections via the {{gitlab instance {option}}} or the {{/gitlab webhook {option}}} commands. Mattermost Advisory ID: MMSA-2026-00600

Affected

8 ranges

Vendor	Product	Version range	Fixed in
linux	linux_kernel	>= 0 < 6.1.162	6.1.162
linux	linux_kernel	>= 6.13.0 < 6.18.7	6.18.7
linux	linux_kernel	>= 6.2.0 < 6.6.122	6.6.122
linux	linux_kernel	>= 6.7.0 < 6.12.67	6.12.67
mattermost	mattermost	<= 11.1.5	—
mattermost	mattermost_server	10.13.0 – 10.13.11	—
mattermost	mattermost_server	11.1.0 – 11.1.5	—
mattermost	mattermost_server	11.3.0 – 11.3.4	—

CVSS provenance

nvdv3.16.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv7.8HIGH