Mattermost versions 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 10.10.x <= 10.10.0, 10.9.x <= 10.9.3 fail to sanitize file names which allows users with file upload permission to overwrite file attachment thumbnails via path traversal in file streaming APIs.
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| github.com/mattermost/mattermost-server(Go) | 10.8.0 | 10.8.4 | N/A |
| github.com/mattermost/mattermost-server(Go) | 10.5.0 | 10.5.9 | N/A |
| github.com/mattermost/mattermost-server(Go) | 10.9.0 | 10.9.4 | N/A |
| github.com/mattermost/mattermost-server(Go) | 10.10.0 | 10.10.1 | N/A |
| github.com/mattermost/mattermost/server/v8(Go) | 0 | 8.0.0-20250708173752-d6b35c41f0ae5 | N/A |
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