CVE-2025-55070

Lack of MFA enforcement in WebSocket connections

State: Published
Severity: 6.5 Medium
Published: Nov 14, 2025
Updated: Nov 14, 2025
Reserved: Oct 15, 2025

Description

Mattermost versions <11 fail to enforce multi-factor authentication on WebSocket connections which allows unauthenticated users to access sensitive information via WebSocket events

Scores

CVSS	Score	Vector	Source
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N	Mattermost

Weaknesses

CWE-306 Missing Authentication for Critical Function

Affected Products

Product	Versions
MattermostMattermost	<11 through <11Affected 11.0.0Not affected

References

https://mattermost.com/security-updates

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