CVE-2026-3231 Cross-site scripting in Checkout Field Editor (Checkout Manager) for WooCommerce
Unauthenticated attackers can inject scripts via checkout fields that execute when administrators view order details, potentially leading to account takeover.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-3231?
CVE-2026-3231 is a high-severity cross-site scripting vulnerability in themehigh Checkout Field Editor (Checkout Manager) for WooCommerce, published on 11 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-79
Which versions are affected by CVE-2026-3231?
How do I fix CVE-2026-3231?
No fix has been published for CVE-2026-3231 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-3231 being exploited?
There is no known exploitation of CVE-2026-3231 in the wild and no public exploit code.
Sources
Also known as GHSA-9prh-3fwj-8frx.