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CVE-2026-45398— Open WebUI: IDOR - Retrieval API Bypasses Knowledge Base Access Controls

CVSS 7.5 · High EPSS 0.04% · P13

Affected Version Matrix 1

VendorProductVersion RangeStatus
open-webuiopen-webui< 0.9.5affected
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I. Basic Information for CVE-2026-45398

Vulnerability Information
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Vulnerability Title
Open WebUI: IDOR - Retrieval API Bypasses Knowledge Base Access Controls
Source: NVD (National Vulnerability Database)
Vulnerability Description
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.5, _validate_collection_access() checks the user-memory-* and file-* collection name prefixes but does not check knowledge base collections, which use raw UUIDs as collection names. Any authenticated user who knows a private knowledge base UUID can read its content through the retrieval query endpoints, even though the knowledge API correctly denies that user access. The same gap affects the retrieval write endpoints (/process/text, /process/file, /process/files/batch, /process/web, /process/youtube), allowing an attacker to inject content into or overwrite another user's knowledge base. This vulnerability is fixed in 0.9.5.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: NVD (National Vulnerability Database)
Vulnerability Title
Open WebUI 安全漏洞
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 0.9.5之前版本存在安全漏洞，该漏洞源于_collection_access验证函数未检查知识库集合，导致任何知道私有知识库UUID的认证用户可通过检索查询端点读取其内容，并通过检索写入端点注入或覆盖内容。
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 < 0.9.5 -

II. Public POCs for CVE-2026-45398

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Qwen3.6-35B-A3B · 7816 chars
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III. Intelligence Information for CVE-2026-45398

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Patches & Fixes for CVE-2026-45398 (1)

Vendor Advisories for CVE-2026-45398 (1)

Vendor Pages for CVE-2026-45398 (1)

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-2026-445528.7 HIGHOpen WebUI: Redis Cache Keys tool_servers and terminal_servers Missing Instance Prefix Ena
CVE-2026-453158.7 HIGHOpen WebUI: Stored XSS via attacker-controlled file extension in /api/v1/audio/transcripti
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-2026-456658.1 HIGHOpen WebUI: Stored XSS in Banner Component via Improper Sanitization Order
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-2026-453018.1 HIGHOpen WebUI: Missing permission check in files API allows authenticated users to list, acce
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-2026-454028.1 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-2026-453387.7 HIGHOpen WebUI: SSRF via OAuth Profile Picture URL in _process_picture_url (oauth.py)
CVE-2026-453037.7 HIGHOpen WebUI: Stored XSS via the HTML renedering view
CVE-2026-445557.6 HIGHOpen WebUI: Base Model Routing Bypasses Access Control via Model Chaining
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-639

V. Comments for CVE-2026-45398

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