{"schemaVersion":3,"id":"CVE-2026-54006","aliases":["GHSA-f3g7-59qc-pqg6","PYSEC-2026-2722"],"status":"published","duplicateOf":null,"title":null,"description":"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.  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