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

> A malicious agent can execute arbitrary JavaScript in the victim's browser by supplying a javascript: URI to the openUrl function in @a2ui/web_core.

- **Severity:** Medium 6.1 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 4 Aug 2026
- **Updated:** 4 Aug 2026
- **Also known as:** GHSA-72qq-p3r5-f7wq, MINI-fvvg-6f9m-2qq8

## What is CVE-2026-10032?

CVE-2026-10032 is a medium-severity cross-site scripting vulnerability in Google @a2ui/web_core, published on 4 Aug 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### 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.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-10032?

2 open source packages ship an affected version, including @a2ui/web_core. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `@a2ui/web_core` | npm | From 0.9.0 | 0.10.2 |
| `@a2ui/web_core` | npm | From 0.9.0 | 0.10.2 |

Products: Google A2ui\/Web Core.

## How do I fix CVE-2026-10032?

Upgrade @a2ui/web_core to 0.10.2 or later.

## Is CVE-2026-10032 being exploited?

There is no known exploitation of CVE-2026-10032 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-10032 and fix it if it is affected.

What it is: CVE-2026-10032 is a medium-severity cross-site scripting vulnerability in Google @a2ui/web_core, published on 4 Aug 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-10032 in the wild and no public exploit code.

Affected packages and fixed versions:
- @a2ui/web_core (npm): affected from 0.9.0; fixed in 0.10.2
- @a2ui/web_core (npm): affected from 0.9.0; fixed in 0.10.2

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-10032/ (Markdown: https://insights.sbomify.com/CVE-2026-10032/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-10032
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-10032
- OSV: https://osv.dev/vulnerability/CVE-2026-10032

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-10032/
Summaries are generated and may contain mistakes; the official description above is the record.