Mattermost fails to perform proper authorization in the /plugins/focalboard/api/v2/users endpoint allowing an attacker who is a guest user and knows the ID of another user to get their information (e.g. name, surname, nickname) via Mattermost Boards.
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| github.com/mattermost/mattermost/server/v8(Go) | 9.1.0 | 9.1.1 | N/A |
| github.com/mattermost/mattermost/server/v8(Go) | 9.0.0 | 9.0.2 | N/A |
| github.com/mattermost/mattermost/server/v8(Go) | 0 | 8.1.4 | N/A |
| github.com/mattermost/mattermost-server/v6(Go) | 0 | 7.8.13 | N/A |
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