CVE-2026-45675
Open WebUI: LDAP and OAuth First-User Race Condition Allows Multiple Admin Accounts
CVSS Score
8.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-269 CWE-362 |
| Vendor | open-webui |
| Product | open-webui |
| Published | May 15, 2026 |
| Last Updated | May 15, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
open-webui / open-webui
< 0.9.0