Security Advisory

CVE-2026-10080

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-08-17 22:04:30

Last updated 2026-08-18 15:23:40

Assigner Mattermost

CVSS score 6.5

State PUBLISHED

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

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