CVE-2026-3117CWE-862broken-access-control

CVE-2026-3117

Medium · published May 18, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
33.1
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00400 · 33.1th percentile
Weakness
CWE-862 · Missing Authorization
Published
2026-05-18T13:16Z
Affected products (3)
ProductVersionsFixed in
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—
References (1)
https://mattermost.com/security-updates · [email protected]
EPSS history
Timeline
  • 18 MAY 08:09Z
    Instance and webhook GitLab plugin commands were able to be run by non-admin users
    cvelistv5