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CVE-2026-45675
HIGH(8.1)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Risk Signal Score20/100 — NIEDRIG
- CVSS 8.1 — Hoch
EPSS-Score
0%
Exploit-Wahrscheinlichkeit (30 Tage)
CVSS Score
8.1
Technische Schwere
Beschreibung
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.
GitHub Advisories
GHSA-h3ww-q6xx-w7x3HIGH
Open WebUI: LDAP and OAuth First-User Race Condition Allows Multiple Admin Accounts
pip/open-webui→ 0.9.0
GitHub Advisory