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CVE-2026-70485— Open WebUI: Any authenticated user can reach internal services and cloud metadata via NAT64-encoded URLs

CVSS 7.1 · High EPSS 0.22% · P13

Possible ATT&CK Techniques 1AI

T1555 · Credentials from Password Stores

Affected Version Matrix 1

VendorProductVersion RangeStatus
open-webuiopen-webui>= 0.9.0, < 0.11.0affected
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I. Basic Information for CVE-2026-70485

Vulnerability Information
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Vulnerability Title
Open WebUI: Any authenticated user can reach internal services and cloud metadata via NAT64-encoded URLs
Source: CVE Program / CVE List V5
Vulnerability Description
Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.0 until 0.11.0, Open WebUI checked whether a user-supplied URL destination was globally routable by applying ipaddress.is_global to the literal IPv6 address without examining IPv4 addresses embedded in transition encodings. On a deployment with a NAT64 gateway, any verified user could wrap an internal or cloud-metadata IPv4 address in the NAT64 well-known prefix, pass the filter, and receive the internal response body through RAG URL ingestion, URL-to-markdown conversion, or web-search content retrieval. This issue is fixed in 0.11.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Open WebUI 服务端请求伪造漏洞
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 0.9.0版本至0.11.0之前版本存在服务端请求伪造漏洞，该漏洞源于对用户提供的URL验证不充分，未检查转换编码中嵌入的IPv4地址，可能导致已认证用户利用NAT64网关包装内部或云元数据IPv4地址绕过过滤器，并通过RAG URL摄取、URL至Markdown转换或网页搜索内容检索获取内部响应信息。
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, < 0.11.0 -

II. Public POCs for CVE-2026-70485

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 8546 chars
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III. Intelligence Information for CVE-2026-70485

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Patches & Fixes for CVE-2026-70485 (1)

Vendor Advisories for CVE-2026-70485 (1)

Vendor Pages for CVE-2026-70485 (1)

Same Patch Batch · open-webui · 2026-08-04 · 17 CVEs total

CVE-2026-704928.7 HIGHOpen WebUI: Stored XSS via unescaped KaTeX render-error fallback in rendered messages
CVE-2026-704868.2 HIGHOpen WebUI: Same-origin XSS to account takeover via terminal file-preview iframe hardcodin
CVE-2026-704828.1 HIGHOpen WebUI: Account takeover via OAuth token exchange accepting tokens issued to any clien
CVE-2026-704948.1 HIGHOpen WebUI: A folder write-collaborator can permanently delete the owner's chats by deleti
CVE-2026-704797.7 HIGHOpen WebUI: SSRF into internal services via unvalidated sub-resource requests in the Playw
CVE-2026-704916.5 MEDIUMOpen WebUI: Tool source code disclosed to read-only users via the tool list and get endpoi
CVE-2026-704936.5 MEDIUMOpen WebUI: Any authenticated user can stall a worker via a knowledge-search pattern that
CVE-2026-704896.5 MEDIUMOpen WebUI: Instance-wide stall via automation recurrence rules that force multi-second pa
CVE-2026-540206.3 MEDIUMOpen WebUI: DNS Rebinding SSRF Bypass
CVE-2026-704906.3 MEDIUMOpen WebUI: Unapproved accounts can open terminal sessions via a WebSocket auth path missi
CVE-2026-704815.4 MEDIUMOpen WebUI: Any member with write access to a standard channel can edit or delete other me
CVE-2026-704875.3 MEDIUMOpen WebUI: Cross-user file content disclosure via request-scoped direct model knowledge m
CVE-2026-704844.3 MEDIUMOpen WebUI: Users denied the image-generation permission can still generate images via cha
CVE-2026-704884.3 MEDIUMOpen WebUI: Deletion of directories and file embeddings in other knowledge bases via sync
CVE-2026-704804.1 MEDIUMOpen WebUI: Client-side SSRF via unrestricted external resource loading in Vega/Vega-Lite
CVE-2026-704833.1 LOWOpen WebUI: Any authenticated user can cancel another user's chat generation via the chat

IV. Related Vulnerabilities

Same product: open-webui
Same vendor: open-webui
Same weakness: CWE-918

V. Comments for CVE-2026-70485

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