CVE-2026-10032
@a2ui/web_core: `openUrl` permits `javascript:` URI execution via agent-supplied button actions
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.
- No known exploitation
- Severity
- Critical, CVSS 9.3 (v3.1)
- EPSS
- 0.13% chance of exploitation in 30 days (EPSS, as of Oct 23, 2026)
- Affected packages
- @a2ui/web_core (npm) >= 0.9.0, < 0.10.2, fixed in 0.10.2 · GHSA-72qq-p3r5-f7wq