Security Advisory

CVE-2026-45675

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-05-15 19:12:57

Last updated 2026-06-18 21:08:01

Assigner GitHub_M

CVSS score 8.1

State PUBLISHED

Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, the 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.

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