---
id: CVE-2026-3117
title: >-
  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 {{gitl…
summary: >-
  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 {{gitl…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-862
vendor: mattermost
product: mattermost_server
affected:
  - 'mattermost_server >= 10.13.0, <= 10.13.11'
  - 'mattermost_server >= 11.1.0, <= 11.1.5'
  - 'mattermost_server >= 11.3.0, <= 11.3.4'
published: '2026-05-18'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T20:10:00.190'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-3117'
references:
  - url: 'https://mattermost.com/security-updates'
    label: responsibledisclosure@mattermost.com
tags:
  - nvd
epss: 0.004
epssPercentile: 0.32564
ingestedAt: '2026-10-14T20:53:12.298Z'
---

## Overview

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

- `mattermost_server >= 10.13.0, <= 10.13.11`
- `mattermost_server >= 11.1.0, <= 11.1.5`
- `mattermost_server >= 11.3.0, <= 11.3.4`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.