GHSA-7h34-9chr-58qhMediumCVSS 6.5

Mattermost Missing Authentication for Critical Function

Published
July 18, 2025
Last Modified
July 21, 2025

🔗 CVE IDs covered (1)

CVE-2025-6226 →

📋 Description

Mattermost versions 10.5.x <= 10.5.6, 10.8.x <= 10.8.1, 10.7.x <= 10.7.3, 9.11.x <= 9.11.16 fail to verify authorization when retrieving cached posts by PendingPostID which allows an authenticated user to read posts in private channels they don't have access to via guessing the PendingPostID of recently created posts.

🎯 Affected products5

  • go/github.com/mattermost/mattermost-server:>= 10.5.0, < 10.5.7
  • go/github.com/mattermost/mattermost-server:>= 10.8.0, < 10.8.2
  • go/github.com/mattermost/mattermost-server:>= 10.7.0, < 10.7.4
  • go/github.com/mattermost/mattermost-server:>= 9.11.0, < 9.11.17
  • go/github.com/mattermost/mattermost/server/v8:< 8.0.0-20250520130510-fa40a8c5d47f

🔗 References (4)