Security Advisory

CVE-2026-8821

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-09-14 10:42:42

Last updated 2026-09-14 11:19:44

Assigner Mattermost

CVSS score 7.1

State PUBLISHED

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

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