CVE-2026-10032
MediumCVSS 6.1Exploitation Probability (EPSS)
Low risk2th percentile - higher than 2% of all known CVEs
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 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.
Risk Assessment
Arbitrary JavaScript execution in the application context can lead to data theft, session hijacking, or full application compromise.
Recommendation
Update @a2ui/web_core to a version where URL validation is fixed. If not possible, restrict the use of the Button component and validate URLs before passing to window.open().
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Original NVD description (English source)
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 data from NVD (NIST) · CISA KEV · EPSS

