Vulnerability · Published Aug 4, 2026 · Assigned by Google

CVE-2026-10032Arbitrary JavaScript Execution via openUrl in @a2ui/web_core

Medium 6.1

In plain English

A medium-severity cross-site scripting in @a2ui/web_core from Google. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 2% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.1Medium

Exploit odds (30 days)0.1%top 97.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	@a2ui/web_core	0.10.2	GHSA-72qq-p3r5-f7wq

Affected products (as reported)

Vendor	Product	Versions
Google	@a2ui/web_core	0.9.00.9.1-alpha.00.9.1-alpha.10.9.1-alpha.20.9.1-alpha.30.9.1-alpha.40.9.1-alpha.50.9.1

Weakness: CWE-79 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:U

References

https://github.com/a2ui-project/a2ui/security/advisories/GHSA-72qq-p3r5-f7wq