Mattermost versions 10.8.x <= 10.8.1, 10.7.x <= 10.7.3, 10.5.x <= 10.5.7, 9.11.x <= 9.11.16 fail to sanitize input paths of file attachments in the bulk import JSONL file, which allows a system admin to read arbitrary system files via path traversal.
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| github.com/mattermost/mattermost-server(Go) | 10.8.0 | 10.8.2 | N/A |
| github.com/mattermost/mattermost-server(Go) | 10.7.0 | 10.7.4 | N/A |
| github.com/mattermost/mattermost-server(Go) | 10.5.0 | 10.5.8 | N/A |
| github.com/mattermost/mattermost-server(Go) | 9.11.0 | 9.11.17 | N/A |
| github.com/mattermost/mattermost/server/v8(Go) | 0 | 8.0.0-20250529054450-d38c27f96fcf | N/A |
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