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Vulnerability record · CVE-2026-16597 · published 29 July 2026

CVE-2026-16597: Cross-site scripting vulnerability

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.

7.2 CVSS 3.1 High EPSS 0.42% · top 66.4% CWE-79 · Cross-site scripting Deferred
7.2CVSS 3.1 base score
0.42%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
7References
30 Jul 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

References

LinkTags
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/browser/duracelltomi-google-tag-manager/tags/1.22.3/public/frontend.php#L1148
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=%2Fduracel
https://www.wordfence.com/threat-intel/vulnerabilities/id/03542812-b6e5-421d-9ba6-43f1c779940f?source=cve

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Source: NIST National Vulnerability Database (record CVE-2026-16597), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.