What’s Vulnerable › Vulnerabilities
CVE-2025-55070: Lack of MFA enforcement in WebSocket connections
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2025-11-14 · updated 2026-10-19
- Weakness: CWE-306
Description
Mattermost versions <11 fail to enforce multi-factor authentication on WebSocket connections which allows unauthenticated users to access sensitive information via WebSocket events
Affected products
- Mattermost: before 11.0.0 — fixed in 11.0.0
How to fix
Upgrade to a fixed version: Mattermost 11.0.0. Check the vendor advisory for mitigations.
References
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