CVE-2026-45675
HIGH
MEDIUM
Priority: 0.03
BB Relevance:
66/100
Published: 2026-05-15
Modified: 2026-11-11
First seen: 2026-11-11
Status: active
Attack Surface
Network
No Auth
No Interaction
Conf. Impact
Integ. Impact
CVSS Vector Breakdown
AV:
Network
AC:
High
PR:
None
UI:
None
S:
Unchanged
C:
High
I:
High
A:
High
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.
Affected Software (1)
| Vendor | Product | Version |
|---|---|---|
| openwebui | open_webui | < 0.9.0 |
References & Advisories (3)
Patch
Issue Tracking
Exploit
Mitigation
Vendor Advisory