VulnerabilityAwaiting Analysis

CVE-2026-10032

A malicious agent can supply a javascript: URI as the url argument of a Button component's functionCall action.

MEDIUM 6.1EPSS 0.20%

Does this matter?

Lower severity and a low EPSS score (0.20%). Track it; it rarely justifies an emergency change on its own.

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.

CVSS 4.0: 6.1 MEDIUMCVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
EPSS: 0.20% probability · 10th percentile
CISA KEV: Not listed
Weakness: CWE-79
Source: cve-coordination@google.com

References

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

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.