---
id: CVE-2026-10032
title: >-
  The openUrl function in @a2ui/web_core passes an agent-controlled URL directly
  to window.open() without validating the URI scheme
summary: >-
  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 ac…
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
vendor: google
product: a2ui/web_core
affected:
  - 'a2ui/web_core >= 0.9.0, < 0.10.2'
patched:
  - a2ui/web_core 0.10.2
published: '2026-08-04'
updated: '2026-09-23'
sourceUpdated: '2026-09-23T15:59:07.417'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-10032'
references:
  - url: >-
      https://github.com/a2ui-project/a2ui/security/advisories/GHSA-72qq-p3r5-f7wq
    label: cve-coordination@google.com
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-10032'
  - url: 'https://github.com/a2ui-project/a2ui/pull/1707'
  - url: >-
      https://github.com/a2ui-project/a2ui/commit/71573078c4168b2dc166bb847c3a85715dadc675
  - url: 'https://github.com/advisories/GHSA-72qq-p3r5-f7wq'
tags:
  - nvd
  - ghsa
  - npm
  - score-dispute
epss: 0.00125
epssPercentile: 0.02216
ingestedAt: '2026-09-23T16:27:22.625Z'
aliases:
  - GHSA-72qq-p3r5-f7wq
ecosystem: npm
scores:
  nvd: 6.1
  ghsa: 9.3
---

## Overview

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.

## Affected

- `a2ui/web_core >= 0.9.0, < 0.10.2`

## Remediation

Upgrade past the affected range:

- `a2ui/web_core 0.10.2`

## Package advisory (CVE-2026-10032)

Affected packages:

- `@a2ui/web_core >= 0.9.0, < 0.10.2`

Patched in:

- `@a2ui/web_core 0.10.2`

Source: https://github.com/advisories/GHSA-72qq-p3r5-f7wq