Vulnerability Description
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, he LDAP and OAuth authentication flows use a TOCTOU (Time-of-Check-Time-of-Use) pattern for first-user admin role assignment. The regular signup handler (signup_handler in auths.py, line 663) was explicitly patched to prevent this race with the comment "Insert with default role first to avoid TOCTOU race", but the LDAP and OAuth code paths were never updated with the same fix. This vulnerability is fixed in 0.9.0.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Openwebui | Open Webui | < 0.9.0 |
Related Weaknesses (CWE)
References
- https://github.com/open-webui/open-webui/commit/96a0b3239b1aadb23fc359bf10849c9bPatch
- https://github.com/open-webui/open-webui/pull/23626Issue Tracking
- https://github.com/open-webui/open-webui/security/advisories/GHSA-h3ww-q6xx-w7x3ExploitMitigationVendor Advisory
FAQ
What is CVE-2026-45675?
CVE-2026-45675 is a vulnerability with a CVSS score of 8.1 (HIGH). Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, he LDAP and OAuth authentication flows use a TOCTOU (Time-of-Check-Time-of-Use) patte...
How severe is CVE-2026-45675?
CVE-2026-45675 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-45675?
Check the references section above for vendor advisories and patch information. Affected products include: Openwebui Open Webui.