CVE-2026-10032: Google a2ui/web Core

Medium severity, CVSS 6.1. EPSS: 0.1% chance of exploitation in the next 30 days.

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 products

• Google a2ui/web Core: from 0.9.0, before 0.10.2 (fixed in 0.10.2)

Published 2026-08-04. Last modified 2026-09-23.