GHSA-q453-638c-h4mrMediumCVSS 6.8

Mattermost Fails to Validate Remote Cluster Upload Sessions

Published
August 21, 2025
Last Modified
August 29, 2025

🔗 CVE IDs covered (1)

CVE-2025-49222 →

📋 Description

Mattermost versions 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 9.11.x <= 9.11.17, 10.9.x <= 10.9.2, 10.10.x <= 10.10.0 fail to validate upload types in remote cluster upload sessions which allows a system admin to upload non-attachment file types via shared channels that could potentially be placed in arbitrary filesystem directories.

🎯 Affected products8

  • go/github.com/mattermost/mattermost-server:>= 10.8.0, <= 10.8.3
  • go/github.com/mattermost/mattermost-server:>= 10.5.0, <= 10.5.8
  • go/github.com/mattermost/mattermost-server:>= 9.11.0, <= 9.11.17
  • go/github.com/mattermost/mattermost-server:>= 10.9.0, <= 10.9.2
  • go/github.com/mattermost/mattermost-server:= 10.10.0
  • go/github.com/mattermost/mattermost/server/v8:< 8.0.0-20250708173752-d6b35c41f0ae5
  • go/github.com/mattermost/mattermost-server/v5:<= 5.39.3
  • go/github.com/mattermost/mattermost-server/v6:<= 5.7.2

🔗 References (4)