CVE-2026-54006
Open WebUI: Calendar event re-parenting allows writing events into another user's calendar
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.
| CWE | CWE-639 |
| Vendor | open-webui |
| Product | open-webui |
| Published | Jun 23, 2026 |
| Last Updated | Jun 23, 2026 |
Get instant alerts for open-webui open-webui
Be the first to know when new medium vulnerabilities affecting open-webui open-webui are published — delivered to Slack, Telegram or Discord.
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N