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CVE-2026-10032— Arbitrary JavaScript Execution via openUrl in @a2ui/web_core

Quick assessment

Affected
Google @a2ui/web_core
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.

Google A2UI是美国Google公司开源的一个声明式 UI 协议与标准库，专为 AI 智能体（Agent）设计。 Google A2UI 0.9.0版本至0.10.1版本存在跨站脚本漏洞，该漏洞源于openUrl函数将代理控制的URL直接传递给window.open()而未验证URI scheme，可能导致在受害者应用浏览器源中执行任意JavaScript，构成存储型/反射型跨站脚本攻击。

CVSS 6.1 · Medium EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 11

VendorProduct Version RangeStatus
Google @a2ui/web_core 0.9.0 affected
0.9.1-alpha.0 affected
0.9.1-alpha.1 affected
0.9.1-alpha.2 affected
0.9.1-alpha.3 affected
0.9.1-alpha.4 affected
0.9.1-alpha.5 affected
0.9.1 affected
… +3 more rows
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I. Basic Information for CVE-2026-10032

Vulnerability Information
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Vulnerability Title
Arbitrary JavaScript Execution via openUrl in @a2ui/web_core
Source: CVE Program / CVE List V5
Vulnerability Description
The openUrl function in @a2ui/web_core passes an agent-controlled URL directly to window.open() without validating the URI scheme. A malicious agent can supply a javascript: URI as the url argument of a Button component's functionCall action. When the user clicks the rendered button, arbitrary JavaScript executes in the victim application's browser origin, constituting a stored/reflected XSS with Critical severity. No non-default configuration is required; the Basic Catalog is enabled by default.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:U
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
Google A2UI 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Google A2UI是美国Google公司开源的一个声明式 UI 协议与标准库，专为 AI 智能体（Agent）设计。 Google A2UI 0.9.0版本至0.10.1版本存在跨站脚本漏洞，该漏洞源于openUrl函数将代理控制的URL直接传递给window.open()而未验证URI scheme，可能导致在受害者应用浏览器源中执行任意JavaScript，构成存储型/反射型跨站脚本攻击。
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
Google @a2ui/web_core 0.9.0 -

II. Public POCs for CVE-2026-10032

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III. Intelligence Information for CVE-2026-10032

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Vendor Advisories for CVE-2026-10032 (1)

IV. Related Vulnerabilities

Same vendor: Google
Same weakness: CWE-79

V. Comments for CVE-2026-10032

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