VULNERABILITY INTELLIGENCE

CVE-2026-10080

CVSS score6.5 MEDIUM
EPSS probability0.42%
CISA KEVNot currently listed
Published2026-08-17
Last modified2026-08-18
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Description

Mattermost versions 11.7.x <= 11.7.6, 10.11.x <= 10.11.21, 11.8.x <= 11.8.3 fails to validate WebSocket command field types which allows an authenticated user to crash the plugin process and deny service to all Boards users via a custom_focalboard_SUBSCRIBE_TEAM message with a non-string teamId.. Mattermost Advisory ID: MMSA-2026-00687

Weakness classification

  • responsibledisclosure@mattermost.com: CWE-704

Primary references