Mattermost versions 10.5.x <= 10.5.4, 9.11.x <= 9.11.13 fail to properly restrict API access to team information, allowing guest users to bypass permissions and view information about public teams they are not members of via a direct API call to /api/v4/teams/{team_id}.
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| github.com/mattermost/mattermost/server/v8(Go) | 0 | 8.0.0-20250422131222-701ddc896a10 | N/A |
| github.com/mattermost/mattermost-server(Go) | 10.5.0 | 10.5.5 | N/A |
| github.com/mattermost/mattermost-server(Go) | 9.11.0 | 9.11.14 | N/A |
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