Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.6, POST /api/v1/calendars/events/{event_id}/update validates that the caller has write access to the calendar the event currently belongs to, but does not validate the destination calendar_id supplied in the request body. The model layer then persists the new calendar_id unconditionally. A regular user-role account can therefore create an event in their own calendar and immediately move it into any other user's calendar whose ID they know — bypassing the authorization check that create_event correctly performs. This vulnerability is fixed in 0.9.6.
| Vendor | Product | Versions |
|---|---|---|
| python | open-webui | < 0.9.6, 0.9.5 |
Updated affected versions to include 0.9.5, changed severity to HIGH, and noted that no exploit exists.
Initial creation
