CVE-2026-3117

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

CVSS v3 6.5 MEDIUM

6.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://mattermost.com/security-updates	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:mattermost:mattermost_server::::::::
	cpe:2.3:a:mattermost:mattermost_server::::::::
	cpe:2.3:a:mattermost:mattermost_server::::::::

History

14 Oct 2026, 20:10

Type	Values Removed	Values Added
Summary		(es) Los plugins de Mattermost versiones menor o igual que 11.5 11.1.5 10.13.11 11.3.4.0 no verifican correctamente los permisos al procesar comandos en el plugin de Gitlab, lo que permite a usuarios normales desinstalar instancias o configurar conexiones de webhook a través de los comandos {{gitlab instance {option}}} o {{/gitlab webhook {option}}}. ID de Aviso de Mattermost: MMSA-2026-00600

Information

Published : 2026-05-18 09:16

Updated : 2026-10-14 20:10

NVD link : CVE-2026-3117

Mitre link : CVE-2026-3117

CVE.ORG link : CVE-2026-3117

JSON object : View

Products Affected

mattermost

mattermost_server

CWE

CWE-862

Missing Authorization

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