CVE-2026-54006: Open WebUI calendar event re-parenting IDOR vulnerability

# CVE-2026-54006: Open WebUI calendar event re-parenting IDOR vulnerability

https://gcdradar.vercel.app/incidents/cve-2026-54006-open-webui-calendar-event-re-parenting-idor-v · AIR-2026-0765 · closed 2026-06-17

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-06-17
- AI role: Attack on AI
- Products: Open WebUI
- CVE ids: CVE-2026-54006
- CVSS: 4.3

## Summary

Open WebUI fails to validate the destination calendar ID when updating calendar events, allowing regular users to move events into other users' calendars. The vulnerability has been disclosed with a patch available.

## What to do

No action recorded; read the sources below and the vendor's advisory.

## Latest updates

- 2026-06-23: CVE-2026-54006: Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. (https://nvd.nist.gov/vuln/detail/CVE-2026-54006)
- 2026-06-17: CVE-2026-54006: Open WebUI IDOR: Calendar event re-parenting allows writing events into another user's calendar (https://github.com/advisories/GHSA-f3g7-59qc-pqg6)

## Sources

- 2026-06-17 GitHub Advisory Database: CVE-2026-54006: Open WebUI IDOR: Calendar event re-parenting allows writing events into another user's calendar https://github.com/advisories/GHSA-f3g7-59qc-pqg6
- 2026-06-23 NVD: CVE-2026-54006: Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. https://nvd.nist.gov/vuln/detail/CVE-2026-54006

Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.