CVEvulnerability

CVE-2026-8821

7.1 HIGH Published 2026-09-14 Modified 2026-10-07 Official page ↗
Status
Analyzed
Published
2026-09-14
Last modified
2026-10-07
Assigner
[email protected]
CVSS 3.1 ([email protected])
7.1 HIGH — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Weaknesses
CWE-862

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 configurations

• mattermost mattermost server (>= 10.11.0 < 10.11.23) • mattermost mattermost server (>= 11.7.0 < 11.7.8) • mattermost mattermost server (>= 11.8.0 < 11.8.5) • mattermost mattermost server (>= 11.9.0 < 11.9.1)

Related

Weakness · CWE (1)

  • CWE-862 Missing Authorization weakness

References