What the vulnerability does
01Description
The Checkout Field Editor (Checkout Manager) for WooCommerce plugin for WordPress is vulnerable to Stored Cross-Site Scripting via custom radio and checkboxgroup field values submitted through the WooCommerce Block Checkout Store API in all versions up to, and including, 2.1.7. This is due to the `prepare_single_field_data()` method in `class-thwcfd-block-order-data.php` first escaping values with `esc_html()` then immediately reversing the escaping with `html_entity_decode()` for radio and checkboxgroup field types, combined with a permissive `wp_kses()` allowlist in `get_allowed_html()` that explicitly permits the `<select>` element with the `onchange` event handler attribute. This makes it possible for unauthenticated attackers to inject arbitrary web scripts via the Store API checkout endpoint that execute when an administrator views the order details page.
Explanation of Vulnerability in Simple Terms
02Summary
The Checkout Field Editor plugin for WooCommerce contains a cross-site scripting (XSS) vulnerability that allows unauthenticated attackers to inject malicious scripts into the site. The vulnerability affects all versions up to 2.1.7. Because the scope is changed, injected scripts can affect other users and site functionality beyond the vulnerable component itself.
What an attacker can do
03Attacker Capabilities
Inject malicious JavaScript that runs in other users' browsers and affects site functionality.
Potential impact on your site
04Site Impact
Attackers can steal customer data, redirect checkout flows, or deface your store without needing to log in.
Conditions required to exploit
05Prerequisites
No authentication or user interaction required; attacker can exploit this over the network.
Key dates
06Disclosure timeline
March 11, 2026
CVE published
April 8, 2026
Record updated
