How severe is CVE-2026-10032?

CVE-2026-10032 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-10032 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-10032?

CVE-2026-10032 affects Google A2ui/web Core. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-10032?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2026-10032 published?

CVE-2026-10032 was published on 2026-08-04 and last updated on 2026-09-23.

CVE-2026-10032

CVE-2026-10032 is a medium-severity vulnerability in Google A2ui/web Core with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v4: 6.1
EPSS exploit prediction: 0% (2nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Google A2ui/web Core
Published: 2026-08-04
Last modified: 2026-09-23

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-10032?: CVE-2026-10032 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-10032 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-10032?: CVE-2026-10032 affects Google A2ui/web Core. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-10032?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-10032 published?: CVE-2026-10032 was published on 2026-08-04 and last updated on 2026-09-23.

References

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

Affected products (1)

cpe:2.3:a:google:a2ui\/web_core:*:*:*:*:*:node.js:*:*

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