CVE-2026-3117 MEDIUM

CVE-2026-3117: Instance and webhook GitLab plugin commands were able to be run by non-admin users

Vendor Mattermost
Product Mattermost
Weakness CWE-862 · Missing authorization
Published May 18, 2026
Last update May 18, 2026
View on NVD All CVEs

CVSS base score

6.5/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

What the vulnerability does

01Description

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

Key dates

02Disclosure timeline

May 18, 2026 CVE published
May 18, 2026 Record updated