CVE-2026-16597

GTM4WP <= 1.22.3 - Unauthenticated Stored Cross-Site Scripting via WooCommerce Billing Fields

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.

We have discovered 126,030 live websites that are affected by CVE-2026-16597.

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Affected Software

Product  Google Tag Manager for WordPress
Category Wordpress Plugins
Vulnerable Domains126,030 live websites (100% of Google Tag Manager for WordPress install base)
Vulnerable Versions
  • from 0 through 1.22.3
Vulnerable Versions Count52 versions ( 98% of all versions)


Common Weakness Enumeration

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')



Details

  • Published - Jul 29, 2026
  • Updated - Jul 29, 2026

Credits

  • lhking (finder)

Website Distribution by Country

Number of websites using CVE-2026-16597
United States36,815 websites


Germany7,586 websites
Netherlands7,218 websites
Italy6,877 websites
France5,971 websites
Poland5,898 websites
GB5,073 websites
Spain4,237 websites
Australia3,461 websites
Brazil2,768 websites

Website Distribution by TLD

Number of websites using CVE-2026-16597
.com49,338 websites
.nl6,672 websites
.it5,360 websites
.pl4,485 websites
.co.uk3,826 websites
.com.au3,651 websites
.de3,631 websites
.org3,478 websites
.com.br2,761 websites
.fr2,556 websites

Vulnerable Versions

Vulnerable versions are highlighted in red

Websites affected by CVE-2026-16597

Top websites that are affected by CVE-2026-16597. Please click on the "Contact us" link to get more information.
DomainCountryRankContacts
**********.de Germany***
*******.edu United States*,***
***********.com United States*,***
******************.com United States*,***
*********.nl United States*,***
*********.com United States*,***
*********.com United States*,***
****.org Hong Kong*,***
***********.com United States*,***
*****.com United States*,***
See full domain list

FAQ

CVE-2026-16597 is Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Google Tag Manager for WordPress
A total of 126,030 websites have been identified as vulnerable to CVE-2026-16597, based on global website indexing conducted by WebTechSurvey.
The Google Tag Manager for WordPress is affected by the CVE-2026-16597 vulnerability.
Google Tag Manager for WordPress versions up to and including 1.22.3 are vulnerable to CVE-2026-16597.

References