VULNERABILITY INTELLIGENCE

CVE-2026-54006

CVSS score4.3 MEDIUM
EPSS probability0.30%
CISA KEVNot currently listed
Published2026-06-23
Last modified2026-06-25
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

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. This vulnerability is fixed in 0.9.6.

Weakness classification

  • CWE-639: Authorization Bypass Through User-Controlled Key

Primary references