CVE-2026-87995— Open WebUI: Same-origin XSS to account takeover via terminal port-preview iframe hardcoding allow-same-origin
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 是一个可扩展、功能丰富且用户友好的自托管 AI 平台。从 0.8.11 到 0.11.1 版本， 文件在一个同时启用了 和 的 iframe 沙箱中渲染终端端口内容。由于终端代理从 Open WebUI 源服务器提供该内容，拥有共享终端服务器访问权限的已认证用户可以在预览端口上托管脚本；当受害者打开预览时，攻击者即可夺取其账户控制权。该问题已在 0.11.1 版本中修复。
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I. Basic Information for CVE-2026-87995
Vulnerability Information
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Vulnerability Title
Open WebUI: Same-origin XSS to account takeover via terminal port-preview iframe hardcoding allow-same-origin
Source: CVE Program / CVE List V5
Vulnerability Description
Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.8.11 until 0.11.1, src/lib/components/chat/FileNav/PortPreview.svelte rendered terminal port content in an iframe sandbox containing both allow-scripts and allow-same-origin. Because the terminal proxy serves that content from the Open WebUI origin, an authenticated user with access to a shared terminal server could host script on a previewed port and take over a victim's account when the victim opened the preview. This issue is fixed in version 0.11.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| open-webui | open-webui | >= 0.8.11, < 0.11.1 | - |
|
II. Public POCs for CVE-2026-87995
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2026-87995 (2)
Same Patch Batch · open-webui · 2026-09-09 · 16 CVEs total
| CVE-2026-87016 | 8.1 HIGH | Open WebUI: Sign-in as another user via wildcard characters in the OAuth subject claim on |
| CVE-2026-87996 | 7.7 HIGH | Open WebUI: SSRF into internal services via DNS rebinding in the Playwright web loader |
| CVE-2026-87011 | 7.5 HIGH | Open WebUI: Unauthenticated requests can stall the server via uncached OIDC fetches in bac |
| CVE-2026-87998 | 7.1 HIGH | Open WebUI: Non-admin users can delete admin-owned external knowledge connections via know |
| CVE-2026-87999 | 7.1 HIGH | Open WebUI: Any authenticated user can reach the Azure platform channel via server-side we |
| CVE-2026-87015 | 6.8 MEDIUM | Open WebUI: A user's session cookies are sent to tool servers configured for bearer authen |
| CVE-2026-87014 | 6.5 MEDIUM | Open WebUI: Admin demoted through SSO role sync keeps read and write access to all users' |
| CVE-2026-88000 | 6.5 MEDIUM | Open WebUI: Any authenticated user can hang the server via message deletion in a cyclic ch |
| CVE-2026-88002 | 6.5 MEDIUM | Open WebUI: Any authenticated user can hang the server via a cyclic chat message history |
| CVE-2026-88001 | 5.0 MEDIUM | Open WebUI: Server-side fetches reach blocked and internal hosts via unvalidated HTTP redi |
| CVE-2026-87012 | 4.3 MEDIUM | Open WebUI: Any authenticated user can suppress calendar alerts instance-wide via a non-nu |
| CVE-2026-87013 | 4.3 MEDIUM | Open WebUI: Any authenticated user can start a non-terminating request via a folder parent |
| CVE-2026-87017 | 4.3 MEDIUM | Open WebUI: Inaccessible knowledge bases are exposed through the built-in knowledge tool o |
| CVE-2026-87994 | 4.3 MEDIUM | Open WebUI: Channel members can overwrite another member's message via the chat completion |
| CVE-2026-87997 | 4.3 MEDIUM | Open WebUI: Any authenticated user can inject chats into another user's folder via chat co |
IV. Related Vulnerabilities
Same product: open-webui
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CVE-2026-88002
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CVE-2026-88001
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CVE-2026-88000
Open WebUI: Any authenticated user can hang the server via m -
CVE-2026-87999
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CVE-2026-87998
Open WebUI: Non-admin users can delete admin-owned external
Same vendor: open-webui
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Open WebUI: Any authenticated user can hang the server via a -
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Open WebUI: Server-side fetches reach blocked and internal h -
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Open WebUI: Any authenticated user can hang the server via m -
CVE-2026-87999
Open WebUI: Any authenticated user can reach the Azure platf -
CVE-2026-87998
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Same weakness: CWE-79
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V. Comments for CVE-2026-87995
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