What the vulnerability does
01Description
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.
Explanation of Vulnerability in Simple Terms
02Summary
GTM4WP versions up to 1.22.3 contain a cross-site scripting (XSS) vulnerability that allows unauthenticated attackers to inject malicious scripts into the site. The vulnerability affects all visitors and can impact site integrity across multiple pages. Site owners should update to a version newer than 1.22.3 immediately.
What an attacker can do
03Attacker Capabilities
Inject malicious JavaScript that runs in visitors' browsers and affects site functionality.
Potential impact on your site
04Site Impact
Visitors' browsers execute attacker-controlled scripts, risking credential theft, malware, or site defacement.
Conditions required to exploit
05Prerequisites
No authentication or user interaction required; attacker can exploit this remotely.
Key dates
06Disclosure timeline
July 29, 2026
CVE published
July 29, 2026
Record updated
