CVE-2026-3117: mattermost server from 10.13.0 (inclusive), through 10.13.11 (inclusive), from 11.1.0 (inclusive), through 11.1.5…

Affected technology

mattermost server · from 10.13.0 (inclusive), through 10.13.11 (inclusive)
mattermost

mattermost server · from 11.1.0 (inclusive), through 11.1.5 (inclusive)
mattermost

mattermost server · from 11.3.0 (inclusive), through 11.3.4 (inclusive)
mattermost

Mattermost · 0 through 11.1.5, 0 through 10.13.11, 0 through 11.3.4
Mattermost

Description’s affected range: 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

Component: Not specified by the source

Attack conditions (Vendor/CNA, CVSS 3.1): Network (remote) · Low privileges required · No user interaction required

What an attacker can do

The source says 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. Vendor/CNA’s CVSS 3.1 assessment (base score 6.5/10) rates confidentiality and integrity impact as none; availability impact as high.