Skip to content

Mattermost does not enforce MFA on WebSocket connections

Moderate severity GitHub Reviewed Published Nov 14, 2025 to the GitHub Advisory Database • Updated Nov 17, 2025

Package

gomod github.com/mattermost/mattermost-server (Go)

Affected versions

< 11.1.0

Patched versions

11.1.0
gomod github.com/mattermost/mattermost/server/v8 (Go)
< 8.0.0-20250912063506-7d8b7b5e4a60
8.0.0-20250912063506-7d8b7b5e4a60

Description

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

References

Published by the National Vulnerability Database Nov 14, 2025
Published to the GitHub Advisory Database Nov 14, 2025
Reviewed Nov 17, 2025
Last updated Nov 17, 2025

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(28th percentile)

Weaknesses

Missing Authentication for Critical Function

The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources. Learn more on MITRE.

CVE ID

CVE-2025-55070

GHSA ID

GHSA-xpg8-8xpv-948p

Source code

Loading Checking history
See something to contribute? Suggest improvements for this vulnerability.