High severity8.1GHSA Advisory· Published May 15, 2026· Updated May 19, 2026
CVE-2026-45675
CVE-2026-45675
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
open-webuiPyPI | < 0.9.0 | 0.9.0 |
Affected products
2<= 0.8.12+ 1 more
- (no CPE)range: <= 0.8.12
- cpe:2.3:a:openwebui:open_webui:*:*:*:*:*:*:*:*range: <0.9.0
Patches
Vulnerability mechanics
References
6- github.com/open-webui/open-webui/commit/96a0b3239b1aadb23fc359bf10849c9ba12fd6ecnvdPatchWEB
- github.com/open-webui/open-webui/security/advisories/GHSA-h3ww-q6xx-w7x3nvdExploitMitigationVendor AdvisoryWEB
- github.com/advisories/GHSA-h3ww-q6xx-w7x3ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-45675ghsaADVISORY
- github.com/open-webui/open-webui/pull/23626nvdIssue TrackingWEB
- github.com/open-webui/open-webui/releases/tag/v0.9.0ghsaWEB
News mentions
0No linked articles in our index yet.