CVE-2025-12689

Published: Dec 17, 2025

Modified: Dec 17, 2025

PUBLISHED

CVSS v3.1

6.5

MEDIUM

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.

Vendor	Product	Versions
Mattermost	Mattermost	affected `11.0.0 - <= 11.0.4` affected `10.12.0 - <= 10.12.2` affected `10.11.0 - <= 10.11.6` unaffected `11.1.0` unaffected `11.0.5` +2 more versions

Weaknesses (CWE)

CWE-1287

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

References

https://mattermost.com/security-updates

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CVE-2025-12689

Description

Affected Products

Weaknesses (CWE)

CVSS v3.1 Details

References