CVE-2026-10032: A2UI web_core improper URL scheme validation in openUrl function

CVE-2026-10032 · Severity: critical · CVSS 9.3 · Published 2026-08-04

The A2UI web_core library's openUrl function fails to validate the URI scheme before passing user-supplied URLs to the browser's window.open() function. An attacker can inject a javascript: URI through a button action, causing arbitrary JavaScript to execute in the victim's browser when the button is clicked. This allows theft of session tokens, user data, and sensitive information, or performing unauthorized actions on behalf of the victim.

Technologies: Google A2ui\. Vendors: Google, npm.

Quick answers

Is CVE-2026-10032 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-10032 being exploited in the wild.
How severe is CVE-2026-10032?
Critical severity, with a CVSS score of 9.3, published 4 August 2026.
Which products and versions are affected?
@a2ui/web_core (npm) >= 0.9.0, < 0.10.2, SEMVER:introduced=0.9.0,fixed=0.10.2.
Is there a fix for CVE-2026-10032?
Yes. @a2ui/web_core (npm): upgrade to 0.10.2 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-10032 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-10032?
Check whether you run Google A2ui\, Google Web Core or @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.

How to fix

  • @a2ui/web_core (npm): upgrade to 0.10.2 or later
    npm install @a2ui/web_core@0.10.2

Technical details

The vulnerability is a cross-site scripting (XSS) flaw in the openUrl function (basic_functions.ts) which accepts agent-controlled URLs without validating the URI scheme. The Zod schema used to validate the url parameter only checks that it is a string, with no allowlist or blocklist of permitted schemes. An attacker can supply a javascript: URI as the url argument of a Button component's functionCall action. When a user clicks the button, window.open() executes the javascript: URI in the victim's browser origin, allowing arbitrary code execution. The vulnerability affects all three renderers (React, Lit, Angular) that depend on web_core's basic catalog. The issue was patched in version 0.10.2 by implementing strict scheme validation to allow only HTTP and HTTPS URIs.

Affected products

  • A2UI Project web_core 0.9.0, 0.9.1, 0.9.2, 0.10.0, 0.10.1

Identifiers

  • CVE-2026-10032
  • GHSA-72qq-p3r5-f7wq

Timeline

  • 2026-08-04: disclosed: CVE-2026-10032 and GHSA-72qq-p3r5-f7wq published
  • 2026-08-03: patched: Fixed in web_core version 0.10.2 via PR #1707

References

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