CVE-2026-10080

MediumCVSS 6.5/10Last modified Aug 18, 2026

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

Metrics

CVSS 3.1 6.5/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-704

Affected software

No affected versions have been published.

Timeline

Published
Aug 17, 2026
Last modified
Aug 18, 2026
NVD status
Analyzed

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CVE-2026-10080: Medium severity, CVSS 6.5 | Vulnix