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CVE-2026-45675— Open WebUI: LDAP and OAuth First-User Race Condition Allows Multiple Admin Accounts

CVSS 8.1 · High EPSS 0.05% · P17

Possible ATT&CK Techniques 1AI

T1136.001 · Local Account

Affected Version Matrix 1

VendorProductVersion RangeStatus
open-webuiopen-webui< 0.9.0affected
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I. Basic Information for CVE-2026-45675

Vulnerability Information
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Vulnerability Title
Open WebUI: LDAP and OAuth First-User Race Condition Allows Multiple Admin Accounts
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
特权管理不恰当
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
open-webuiopen-webui < 0.9.0 -

II. Public POCs for CVE-2026-45675

#POC DescriptionSource LinkShenlong Link
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Qwen3.6-35B-A3B · 8603 chars
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III. Intelligence Information for CVE-2026-45675

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Same Patch Batch · open-webui · 2026-05-15 · 59 CVEs total

CVE-2026-445519.1 CRITICALOpen WebUI: LDAP Empty Password Authentication Bypass
CVE-2026-456728.8 HIGHOpen WebUI: Jupyter code execution works despite `ENABLE_CODE_EXECUTION=false` — feature g
CVE-2026-453158.7 HIGHOpen WebUI: Stored XSS via attacker-controlled file extension in /api/v1/audio/transcripti
CVE-2026-445528.7 HIGHOpen WebUI: Redis Cache Keys tool_servers and terminal_servers Missing Instance Prefix Ena
CVE-2026-453318.5 HIGHOpen WebUI: Full SSRF Vulnerability in the RAG Web Search Feature
CVE-2026-454008.5 HIGHOpen WebUI: Server-Side Request Forgery (SSRF) bypass in `validate_url`
CVE-2026-454018.5 HIGHOpen WebUI: SSRF Bypass via HTTP Redirect Following in Web-Fetch and Image-Load Endpoints
CVE-2026-445708.3 HIGHOpen WebUI: Inconsistent authorization controls within memories API
CVE-2026-445658.1 HIGHOpen WebUI: Open WebUI Arbitrary File Write, Delete via Path Traversal
CVE-2026-445538.1 HIGHOpen WebUI: Stale Admin Role in Socket.IO Session Pool Enables Post-Demotion Cross-User No
CVE-2026-445548.1 HIGHOpen WebUI: Knowledge Base Destruction and RAG Poisoning via Unauthorized Collection Overw
CVE-2026-453018.1 HIGHOpen WebUI: Missing permission check in files API allows authenticated users to list, acce
CVE-2026-456658.1 HIGHOpen WebUI: Stored XSS in Banner Component via Improper Sanitization Order
CVE-2026-454028.1 HIGHOpen WebUI: Cross-User File Access via Unchecked file_id in Folder Knowledge and Knowledge
CVE-2026-456718.0 HIGHOpen WebUI: shared-chat branch ignores access_type, allowing unauthorized file deletion
CVE-2026-453037.7 HIGHOpen WebUI: Stored XSS via the HTML renedering view
CVE-2026-453387.7 HIGHOpen WebUI: SSRF via OAuth Profile Picture URL in _process_picture_url (oauth.py)
CVE-2026-445557.6 HIGHOpen WebUI: Base Model Routing Bypasses Access Control via Model Chaining
CVE-2026-453987.5 HIGHOpen WebUI: IDOR - Retrieval API Bypasses Knowledge Base Access Controls
CVE-2026-447217.3 HIGHOpen WebUI: Stored XSS via Model Description

Showing top 20 of 59 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: open-webui
Same vendor: open-webui
Same weakness: CWE-269

V. Comments for CVE-2026-45675

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