Mattermost fails to check the required permissions in the POST /api/v4/channels/stats/member_count API resulting in channel member counts being leaked to a user without permissions.
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| github.com/mattermost/mattermost/server/v8(Go) | 0 | 8.1.8 | N/A |
| github.com/mattermost/mattermost/server/v8(Go) | 9.0.0 | 9.3.0 | N/A |
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