{"cve":"CVE-2026-54006","nvd":{"published":"2026-06-23T18:18:05.663","modified":"2026-06-25T13:41:57.843","status":"Analyzed","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","score":4.3},"cwes":["CWE-639"],"references":["https://github.com/open-webui/open-webui/security/advisories/GHSA-f3g7-59qc-pqg6","https://github.com/open-webui/open-webui/security/advisories/GHSA-f3g7-59qc-pqg6"],"products":["openwebui:open_webui"],"source":"nvd","synced_at":"2026-10-19T22:41:17.107060303+00:00"},"epss":{"cve":"CVE-2026-54006","score":0.00299,"percentile":0.22646,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-f3g7-59qc-pqg6","url":"https://osv.dev/vulnerability/GHSA-f3g7-59qc-pqg6","summary":"Open WebUI IDOR: Calendar event re-parenting allows writing events into another user's calendar","modified":"2026-07-20T21:15:27.381804756Z","packages":[{"ecosystem":"PyPI","name":"open-webui","purl":"pkg:pypi/open-webui","ranges":["<0.9.6"],"fixed":["0.9.6"]}]},{"id":"PYSEC-2026-2722","url":"https://osv.dev/vulnerability/PYSEC-2026-2722","summary":"Open WebUI IDOR: Calendar event re-parenting allows writing events into another user's calendar","modified":"2026-07-13T16:32:19.906850626Z","packages":[{"ecosystem":"PyPI","name":"open-webui","purl":"pkg:pypi/open-webui","ranges":["<0.9.6"],"fixed":["0.9.6"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}