Vulnerabilities CVE-2026-10080

CVE-2026-10080

Medium

Open

TLP:CLEAR

Boards plugin panics on WebSocket command with non-string field types

NVD CVE.org

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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

Details

CVSS Score: 6.5
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Confidence: 90%
Published: Aug 17, 2026
Last Modified: Aug 17, 2026

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