CVE-2025-12689: DoS in Calls plugin via malformed UTF-8 in WebSocket request
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.
Affected Software
Remediation
Information
Event History
Frequently Asked Questions
What is the severity of CVE-2025-12689?
CVE-2025-12689 has been rated as a medium severity vulnerability due to its potential to crash the Calls plug-in.
How do I fix CVE-2025-12689?
To fix CVE-2025-12689, upgrade Mattermost to version 11.0.5 or later, 10.12.3 or later, or 10.11.7 or later.
What versions are affected by CVE-2025-12689?
CVE-2025-12689 affects Mattermost versions 11.0.x up to 11.0.4, 10.12.x up to 10.12.2, and 10.11.x up to 10.11.6.
What kind of attack does CVE-2025-12689 enable?
CVE-2025-12689 allows attackers to crash the Calls plug-in by sending malformed WebSocket request fields.
Where can I find more information on CVE-2025-12689?
For more information on CVE-2025-12689, refer to the security updates section of the Mattermost website.