CVE-2026-10080
Medium · 6.5CVSS
6.5
EPSS
0.4%
Published
Aug 17, 2026
CISA due date
—
The record
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
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|
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