Checkout Field Editor (Checkout Manager) for WooCommerce <= 2.1.7 - Unauthenticated Stored Cross-Site Scripting via Block Checkout Custom Radio Field
Strategic Overview
- Status
- Patched in 2.1.8
- Affected Plugin
- Checkout Field Editor (Checkout Manager) for WooCommerce
- Affected Version
<= 2.1.7- CVSS
- 7.2High
- Weakness type
- CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
- CVE
CVE-2026-3231
At a glance
CVE-2026-3231 is a high-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Checkout Field Editor (Checkout Manager) for WooCommerce WordPress plugin, affecting versions <= 2.1.7. It carries a CVSS score of 7.2 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 2.1.8; sites on affected versions should update now. Disclosed March 2026, reported by Dmitrii Ignatyev.
Vulnerability Overview
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.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user.
CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Checkout Field Editor (Checkout Manager) for WooCommerce <= 2.1.7 carries this weakness at prepare_single_field_data(), and reaching it takes no account at all. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.
Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. For Checkout Field Editor (Checkout Manager) for WooCommerce the fix is 2.1.8: builds <= 2.1.7 are affected, anything from 2.1.8 onward is not.
Remediation
Update to version 2.1.8, or a newer patched version
How does WordSec protect against this?
Requests carrying this pattern arrive without a session, so nothing upstream of the firewall gets a chance to reject them: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Checkout Field Editor (Checkout Manager) for WooCommerce 2.1.8 closes this, and updating the plugin is the step that ends it.
- Firewall
- Login Security
- Alerts
External References
Related records
Same weakness class
Other vulnerabilities in Checkout Field Editor (Checkout Manager) for WooCommerce
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