Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, the GET /api/v1/channels/{id}/members endpoint only checks membership for group and dm channel types (lines 467-469). For standard channels — including private ones — there is no channel_has_access check before returning the member list. Any authenticated user who knows a private channel's UUID can enumerate all users with access to that channel. This vulnerability is fixed in 0.9.0.

Open WebUI Missing Access Check on Channel Members Endpoint for Standard Channels

Уязвимость веб-интерфейса на базе искусственного интеллекта Open WebUI, связанная с отсутствием авторизации, позволяющая нарушителю получить несанкционированный доступ к защищаемой информации