XSS in Google @A2ui/web Core

CVE-2026-10032

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.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (9.7th percentile) — read the EPSS interpretation.