CVE-2026-3117

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

State: Published
Severity: 6.5 Medium
Published: May 18, 2026
Updated: May 18, 2026
Reserved: Feb 24, 2026

Description

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

Scores

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

Weaknesses

CWE-862 Missing Authorization

Affected Products

Product	Versions
MattermostMattermost	11.1.5 and earlierAffected 10.13.11 and earlierAffected 11.3.4 and earlierAffected 11.6.0Not affected 11.5.2Not affected 10.11.14Not affected 11.4.4Not affected

References

MMSA-2026-00600vendor-advisory

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