CVE-2026-45666: Open WebUI IDOR Vulnerability in User Notes

# CVE-2026-45666: Open WebUI IDOR Vulnerability in User Notes

https://gcdradar.vercel.app/incidents/cve-2026-45666-open-webui-idor-vulnerability-in-user-notes · AIR-2026-0662 · closed 2026-05-14

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-05-14
- AI role: Attack on AI
- Products: Open WebUI
- CVE ids: CVE-2026-45666
- CVSS: 6.5

## Summary

An insecure direct object reference vulnerability in Open WebUI lets authenticated users access other users' private notes. The flaw enables unauthorized data disclosure through unverified API endpoints.

## What to do

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

## Latest updates

- 2026-05-15: CVE-2026-45666: Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. (https://nvd.nist.gov/vuln/detail/CVE-2026-45666)
- 2026-05-14: CVE-2026-45666: Open WebUI has an Indirect Object Reference (IDOR) in user notes (https://github.com/advisories/GHSA-x3qm-p8hr-3c3h)

## Sources

- 2026-05-14 GitHub Advisory Database: CVE-2026-45666: Open WebUI has an Indirect Object Reference (IDOR) in user notes https://github.com/advisories/GHSA-x3qm-p8hr-3c3h
- 2026-05-15 NVD: CVE-2026-45666: Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. https://nvd.nist.gov/vuln/detail/CVE-2026-45666

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