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CVE-2026-59214— Open WebUI: Stored web worker XSS via Pyodide

Quick assessment

Affected
open-webui open-webui
Exploitation
Public or AI PoC available; prioritize validation
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 0.10.0之前版本存在跨站脚本漏洞，该漏洞源于同源Web Worker中运行客户端侧Pyodide Python，允许存储的聊天负载使用pyodide.http.pyfetch或js模块的fetch及XMLHttpRequest API在受害者点击运行时发起已认证的同源请求，可访问仅管理员端点并通过配置的工具执行服务器端代码。

CVSS 7.3 · High EPSS 0.42% · P34

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
open-webui open-webui < 0.10.0 affected
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I. Basic Information for CVE-2026-59214

Vulnerability Information
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Vulnerability Title
Open WebUI: Stored web worker XSS via Pyodide
Source: CVE Program / CVE List V5
Vulnerability Description
Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. Prior to 0.10.0, Open WebUI runs client-side Python with Pyodide in a same-origin web worker, allowing stored chat payloads that use pyodide.http.pyfetch or the js module fetch and XMLHttpRequest APIs to issue authenticated same-origin requests when a victim clicks Run, which can reach admin-only endpoints and execute server-side code through configured tools. This issue is fixed in version 0.10.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/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
Vulnerability Title
Open WebUI 跨站脚本漏洞
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 0.10.0之前版本存在跨站脚本漏洞，该漏洞源于同源Web Worker中运行客户端侧Pyodide Python，允许存储的聊天负载使用pyodide.http.pyfetch或js模块的fetch及XMLHttpRequest API在受害者点击运行时发起已认证的同源请求，可访问仅管理员端点并通过配置的工具执行服务器端代码。
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 < 0.10.0 -

II. Public POCs for CVE-2026-59214

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 5417 chars
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In-depth vulnerability mechanism
Trigger conditions & impact
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Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-59214

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Vendor Advisories for CVE-2026-59214 (1)

Same Patch Batch · open-webui · 2026-07-09 · 17 CVEs total

CVE-2026-59224 8.0 HIGH Open WebUI: Terminal proxy forwards a spoofable, integrity-unbound user identity to the up
CVE-2026-59216 7.7 HIGH Open WebUI: Cross-user code-interpreter and tool execution via unvalidated Socket.IO event
CVE-2026-59221 7.7 HIGH open-webui terminal proxy path traversal guard bypass via 9x encoded traversal
CVE-2026-59219 7.1 HIGH Open WebUI: Realtime endpoints accept Redis-revoked JWTs after signout/backchannel logout
CVE-2026-59220 6.5 MEDIUM Open WebUI: ReDoS in skill-mention regexes causes whole-instance DoS on default config
CVE-2026-59212 5.4 MEDIUM Open WebUI: Model meta.knowledge read-only file access can be upgraded to file write/delet
CVE-2026-59225 5.4 MEDIUM Open WebUI: Arena task endpoints can bypass underlying model access controls
CVE-2026-59218 5.3 MEDIUM Open WebUI: Account enumeration via observable login timing discrepancy
CVE-2026-59227 4.3 MEDIUM Open WebUI: POST /api/v1/images/edit bypasses the global image-edit switch and the per-use
CVE-2026-59217 4.3 MEDIUM Open WebUI: Upload `metadata.knowledge_id` bypasses the knowledge-base write-access check
CVE-2026-59223 4.3 MEDIUM Open WebUI: `WEB_FETCH_FILTER_LIST` host allow/block filter bypassable via URL path and no
CVE-2026-59213 3.5 LOW Open WebUI: Cross-user model-list exposure via static cache key in get_all_models (aiocach
CVE-2026-59226 3.1 LOW Open WebUI: Scheduled automations continue after pending-user deactivation and stored mode
CVE-2026-59715 3.1 LOW Open WebUI: Unauthenticated WebSocket Access to Collaborative Document Handlers (ydoc:awar
CVE-2026-59215 3.1 LOW Open WebUI: Private channel messages can be disclosed through cross-channel thread parent_
CVE-2026-59222 Open WebUI: /api/v1/channels/{id}/members exposes full user model including sensitive cred

IV. Related Vulnerabilities

Same product: open-webui
Same vendor: open-webui
Same weakness: CWE-79

V. Comments for CVE-2026-59214

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