← Database

CVE-2026-8821

HIGH CVSS: 7.1 Published: 2026-09-14 Modified: 2026-09-16

Description

Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7, 10.11.x <= 10.11.22 fail to validate channel member-management permission during playbook run creation, allowing an authenticated channel member to add an arbitrary user to a restricted channel via the run owner field.. Mattermost Advisory ID: MMSA-2026-00677

Affected Platforms

Unknown

Weakness Type

CWE-862

References