QwikSec

Security Database

CVE

CWE

Training

CVE-2026-45675

Published: May 15, 2026

Modified: May 19, 2026

PUBLISHED

CVSS v3.1

8.1

HIGH

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.

Vendor	Product	Versions
open-webui	open-webui	affected `< 0.9.0`

Weaknesses (CWE)

CVSS v3.1 Details

CVSS v3.1 Vector

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

References

https://github.com/open-webui/open-webui/security/advisories/GHSA-h3ww-q6xx-w7x3

x_refsource_CONFIRM

https://github.com/open-webui/open-webui/pull/23626

x_refsource_MISC

https://github.com/open-webui/open-webui/commit/96a0b3239b1aadb23fc359bf10849c9ba12fd6ec

x_refsource_MISC

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