CVE-2025-55070 — Missing Authentication for Critical Function in Mattermost Mattermost-server
Severity
7.5HIGHNVD
CNA6.5
EPSS
0.1%
top 66.94%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
Timeline
PublishedNov 14
Latest updateNov 17
Description
Mattermost versions <11 fail to enforce multi-factor authentication on WebSocket connections which allows unauthenticated users to access sensitive information via WebSocket events
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NExploitability: 3.9 | Impact: 3.6
Affected Packages4 packages
🔴Vulnerability Details
4OSV▶
Mattermost does not enforce MFA on WebSocket connections in github.com/mattermost/mattermost-server↗2025-11-17