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CVE-2026-54021— Open WebUI: Authenticated users can target arbitrary configured Ollama backends via unguarded url_idx path parameter

Quick assessment

Affected
open-webui open-webui
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Open WebUI是Open WebUI团队开源的一个可扩展、功能丰富、用户友好的自托管 WebUI。 Open WebUI 0.9.6之前版本存在授权问题漏洞，该漏洞源于Ollama代理路由对url_idx路径参数直接索引访问，访问控制仅验证用户是否能使用请求的模型而未验证后端路由，导致任何认证用户可以通过附加任意url_idx强制请求到达未授权的Ollama后端。

CVSS 6.3 · Medium EPSS 0.28% · P19

Affected Version Matrix 1

VendorProduct Version RangeStatus
open-webui open-webui < 0.9.6 affected
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I. Basic Information for CVE-2026-54021

Vulnerability Information
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Vulnerability Title
Open WebUI: Authenticated users can target arbitrary configured Ollama backends via unguarded url_idx path parameter
Source: CVE Program / CVE List V5
Vulnerability Description
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.6, several direct, index-addressed Ollama proxy routes accept a caller-supplied url_idx path parameter and use it as a raw index into the admin-configured OLLAMA_BASE_URLS list. Access control on these routes validates only whether the user may use the requested model, never which backend the request is routed to. Any authenticated user can append an arbitrary url_idx to force their request onto an Ollama backend they were never authorized to reach, including internal, higher-privilege, or explicitly admin-disabled backends. This vulnerability is fixed in 0.9.6.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Open WebUI 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Open WebUI是Open WebUI团队开源的一个可扩展、功能丰富、用户友好的自托管 WebUI。 Open WebUI 0.9.6之前版本存在授权问题漏洞，该漏洞源于Ollama代理路由对url_idx路径参数直接索引访问，访问控制仅验证用户是否能使用请求的模型而未验证后端路由，导致任何认证用户可以通过附加任意url_idx强制请求到达未授权的Ollama后端。
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

Vendor Product Affected Versions CPE Subscribe
open-webui open-webui < 0.9.6 -

II. Public POCs for CVE-2026-54021

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III. Intelligence Information for CVE-2026-54021

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Vendor Advisories for CVE-2026-54021 (1)

Same Patch Batch · open-webui · 2026-06-23 · 15 CVEs total

CVE-2026-54011 8.7 HIGH Open WebUI: Stored XSS in Mermaid Markdown Preview
CVE-2026-54008 8.5 HIGH Open WebUI: Redirect-Bypass SSRF in OAuth `_process_picture_url`
CVE-2026-54010 8.3 HIGH Open WebUI: Forged chat-file link allows cross-user file read and deletion
CVE-2026-54018 7.7 HIGH Open WebUI: SSRF Protection Bypass in Playwright Web Loader via HTTP Redirects
CVE-2026-54013 7.6 HIGH Open WebUI: Stored XSS to Account Takeover via Model Profile Images in Open WebUI
CVE-2026-54012 7.1 HIGH Open WebUI: Forged model meta.knowledge allows cross-user file read and deletion
CVE-2026-54009 6.5 MEDIUM Open WebUI: Cross-user file disclosure via /api/chat/completions image_url field
CVE-2026-54019 6.5 MEDIUM Open WebUI: RAG ACL Bypass in Milvus Multitenancy Mode
CVE-2026-54015 6.4 MEDIUM Open WebUI: Prompt history IDOR: unbound history_id allows cross-prompt read and deletion
CVE-2026-54022 5.3 MEDIUM Open WebUI: Any authenticated user can read other users' private notes via Socket.IO
CVE-2026-54016 4.3 MEDIUM Open WebUI: Open WebUI BOLA: `search_knowledge_files` Allows Unauthorized Knowledge Base F
CVE-2026-54006 4.3 MEDIUM Open WebUI: Calendar event re-parenting allows writing events into another user's calendar
CVE-2026-54014 4.3 MEDIUM Open WebUI: Sibling-Prefix Path Traversal via /cache/{path} in open-webui/open-webui
CVE-2026-54007 Open WebUI: Cross-origin postMessage confirmation bypass via action:submit

IV. Related Vulnerabilities

Same product: open-webui
Same vendor: open-webui
Same weakness: CWE-863

V. Comments for CVE-2026-54021

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