XSS in Google @A2ui/web Core
CVE-2026-10032
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 class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.001 (2.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 2nd percentile — 2.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: 0.000
Affected products
- Google @A2ui/web Core — versions 0.9.0, 0.9.1-alpha.0, 0.9.1-alpha.1
- Google A2ui\/web Core
Weakness classification (CWE)
References
- github.com/a2ui-project/a2ui/security/advisories/GHSA-72qq-p3r5-f7wq (Vendor Advisory)
Frequently asked questions
- What is CVE-2026-10032?
- CVE-2026-10032 is a medium-severity vulnerability in Google @A2ui/web Core, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-08-04.
- How severe is CVE-2026-10032?
- Medium severity. CVSS v3 base score is 6.1 out of 10.