GHSA-q453-638c-h4mr
Mattermost Fails to Validate Remote Cluster Upload Sessions
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| Go | github.com/mattermost/mattermost-server | >= 10.8.0, < 10.8.4 | 10.8.4 |
| Go | github.com/mattermost/mattermost-server | >= 10.5.0, < 10.5.9 | 10.5.9 |
| Go | github.com/mattermost/mattermost-server | >= 9.11.0, < 9.11.18 | 9.11.18 |
| Go | github.com/mattermost/mattermost-server | >= 10.9.0, < 10.9.3 | 10.9.3 |
| Go | github.com/mattermost/mattermost-server | >= 10.10.0, < 10.10.1 | 10.10.1 |
| Go | github.com/mattermost/mattermost/server/v8 | < 8.0.0-20250708173752-d6b35c41f0ae5 | 8.0.0-20250708173752-d6b35c41f0ae5 |
| Go | github.com/mattermost/mattermost-server/v5 | <= 5.39.3 | no fix listed |
| Go | github.com/mattermost/mattermost-server/v6 | <= 5.7.2 | no fix listed |
Details
As written in the advisory (Markdown source, shown as plain text).
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.
References
External links from the advisory. They lead to third-party sites.