Duplicate Advisory: @a2ui/web_core: `openUrl` permits `javascript:` URI execution via agent-supplied button actions
Severity: medium · CVSS 6.1 · Published 2026-08-04
## Duplicate Advisory
This advisory has been withdrawn because it is a duplicate of GHSA-72qq-p3r5-f7wq. This link is maintained to preserve external references.
## Original Description
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.
No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.
How severe is This vulnerability?
Medium severity, with a CVSS score of 6.1, published 4 August 2026.
Which products and versions are affected?
@a2ui/web_core (npm) >= 0.9.0, < 0.10.2.
Is there a fix for This vulnerability?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
Am I affected?
Check whether you run @a2ui/web_core (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.