Headline
GHSA-q453-638c-h4mr: Mattermost Fails to Validate Remote Cluster Upload Sessions
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.
- GitHub Advisory Database
- GitHub Reviewed
- CVE-2025-49222
Mattermost Fails to Validate Remote Cluster Upload Sessions
Moderate severity GitHub Reviewed Published Aug 21, 2025 to the GitHub Advisory Database • Updated Aug 21, 2025
Package
gomod github.com/mattermost/mattermost-server (Go)
Affected versions
>= 10.8.0, <= 10.8.3
>= 10.5.0, <= 10.5.8
>= 9.11.0, <= 9.11.17
>= 10.9.0, <= 10.9.2
= 10.10.0
Patched versions
10.8.4
10.5.9
9.11.18
10.9.3
10.10.1
gomod github.com/mattermost/mattermost/server/v8 (Go)
< 8.0.0-20250708173752-d6b35c41f0ae5
8.0.0-20250708173752-d6b35c41f0ae5
Published to the GitHub Advisory Database
Aug 21, 2025
Last updated
Aug 21, 2025