CVE-2025-55070

Lack of MFA enforcement in WebSocket connections

CVSS 6.5 MEDIUMEPSS 0.3%CWE-306

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 6.5EPSS 0.3%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

14 Nov 2025Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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

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

Affected products

Mattermost · Mattermost

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References

https://mattermost.com/security-updates