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.
| Version | Type | Source | Base | Exp | Imp |
|---|---|---|---|---|---|
| 4.0 | Primary | cve.org | 6.1 | — | — |
| 4.0 | Secondary | ENISA EUVD | 6.1 | — | — |
| 4.0 | Secondary | NVD | 6.1 | — | — |