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CVE-2026-44551— Open WebUI: LDAP Empty Password Authentication Bypass

CVSS 9.1 · Critical EPSS 0.04% · P11

Possible ATT&CK Techniques 1AI

T1078 · Valid Accounts

Affected Version Matrix 1

VendorProductVersion RangeStatus
open-webuiopen-webui< 0.9.0affected
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I. Basic Information for CVE-2026-44551

Vulnerability Information
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Vulnerability Title
Open WebUI: LDAP Empty Password Authentication Bypass
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, the LDAP authentication endpoint does not validate that the submitted password is non-empty before performing a Simple Bind against the LDAP server. The LdapForm Pydantic model accepts password: str with no minimum length constraint, so an empty string passes validation. The subsequent Connection.bind() call succeeds on vulnerable LDAP servers, and the application issues a full session token for the target user. This vulnerability is fixed in 0.9.0.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
认证机制不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Open WebUI 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Open WebUI是Open WebUI开源的一个可扩展、功能丰富、用户友好的自托管 WebUI。 Open WebUI 0.9.0之前版本存在授权问题漏洞，该漏洞源于LDAP认证端点未验证提交密码非空即执行简单绑定，LdapForm Pydantic模型接受password: str且无最小长度约束，空字符串通过验证，后续Connection.bind()调用在易受攻击的LDAP服务器上成功，应用程序为目标用户发放完整会话令牌。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
open-webuiopen-webui < 0.9.0 -

II. Public POCs for CVE-2026-44551

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III. Intelligence Information for CVE-2026-44551

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

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-2026-456758.1 HIGHOpen WebUI: LDAP and OAuth First-User Race Condition Allows Multiple Admin Accounts
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-287

V. Comments for CVE-2026-44551

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