| Component | Open WebUI |
| Severity | medium (CVSS 4.3) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N |
| Published (NVD) | 2026-06-23 |
| Last modified | 2026-06-25 |
| Affected versions | open_webui < 0.9.6 |
| Fixed in | 0.9.6 |
| Weakness | CWE-639 |
| CISA KEV | not listed |
NVD 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.
What to do
- Upgrade Open WebUI to
0.9.6or later. - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
Read more
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