SecuriTricks - CVE-2026-3117

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

Product(s) Impacted

Vendor	Product	Versions
Mattermost	Plugins	10.13.11, 11.1.5, 11.3.4.0, <11.5

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-862

Missing Authorization

The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

*CPE(s)

Affected systems and software identified for this CVE.

Type	Vendor	Product	Version	Update	Edition	Language	Software Edition	Target Software	Target Hardware	Other Information
a	mattermost	plugins	10.13.11	/	/	/	/	/	/	/
a	mattermost	plugins	11.1.5	/	/	/	/	/	/	/
a	mattermost	plugins	11.3.4.0	/	/	/	/	/	/	/
a	mattermost	plugins	<11.5	/	/	/	/	/	/	/

References

https://mattermost.com/security-updates

CVSS Score

6.5 / 10

CVSS Data - 3.1

Attack Vector: NETWORK
Attack Complexity: LOW
Privileges Required: LOW
Scope: UNCHANGED
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: HIGH

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

View Vector String

Timeline

Published: May 18, 2026, 9:16 a.m.
Last Modified: May 18, 2026, 5:32 p.m.

Status : Undergoing Analysis

CVE has been recently published to the CVE List and has been received by the NVD.

More info

Source

[email protected]

CVE-2026-3117