CVE-2025-12689

MediumCVSS 6.5/10Last modified Oct 13, 2026

Description

Mattermost versions 11.0.x <= 11.0.4, 10.12.x <= 10.12.2, 10.11.x <= 10.11.6 fail to check WebSocket request field for proper UTF-8 format, which allows attacker to crash Calls plug-in via sending malformed request.

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-1287

Affected software

Vendor	Product	Versions
Mattermost	Mattermost	>= 11.0.0, <= 11.0.4; >= 10.12.0, <= 10.12.2; >= 10.11.0, <= 10.11.6

References

https://mattermost.com/security-updatesVendor Advisory

Timeline

Published: Dec 17, 2025
Last modified: Oct 13, 2026
NVD status: Analyzed

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