GHSA-9hh7-6558-qfp2LowCVSS 3.0

Mattermost allows other users to determine when users had read channels via channel member objects

Published
November 18, 2025
Last Modified
November 27, 2025

🔗 CVE IDs covered (1)

CVE-2025-55074 →

📋 Description

Mattermost versions 10.11.x <= 10.11.3, and 10.5.x <= 10.5.11 fail to enforce access permissions on the Agents plugin which allows other users to determine when users had read channels via channel member objects.

🎯 Affected products3

  • go/github.com/mattermost/mattermost-server:>= 10.11.0, < 10.11.4
  • go/github.com/mattermost/mattermost-server:>= 10.5.0, < 10.5.12
  • go/github.com/mattermost/mattermost/server/v8:< 8.0.0-20250905150616-ba86dfc5876b6

🔗 References (8)