CVE-2026-3117 PUBLISHED

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

Assigner: Mattermost
Reserved: 24.02.2026 Published: 18.05.2026 Updated: 18.05.2026

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

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS Score: 6.5

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	None
Privileges Required	Low	Integrity Impact	None
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	Mattermost
Product	Mattermost
Versions	Default: unaffected affected from 0 to 11.1.5 (incl.) affected from 0 to 10.13.11 (incl.) affected from 0 to 11.3.4 (incl.) Version 11.6.0 is unaffected Version 11.5.2 is unaffected Version 10.11.14 is unaffected Version 11.4.4 is unaffected

Solutions

Update Mattermost Plugins to versions 11.6.0, 11.5.2, 10.11.14, 11.4.4 or higher.

Credits

daw10 finder

References

MMSA-2026-00600

Problem Types

CWE-862: Missing Authorization CWE