CVE-2026-19802: Checkout Custom Fields Builder for WooCommerce <= 1.1.5 - Missing Authorization to Authenticated (Subscriber+) Arbitrary Plugin Installation via 'plugin' Parameter
The Checkout Custom Fields Builder for WooCommerce plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 1.1.5. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for authenticated attackers, with subscriber-level access and above, to install and activate an arbitrary attacker-hosted plugin, resulting in remote code execution on the server. The required nonce is emitted inline on all admin pages accessible to subscribers when WooCommerce is inactive, meaning any subscriber-level user can harvest it and trigger the exploit without any additional privileges.
Affected Software
Event History
Frequently Asked Questions
Who can exploit this vulnerability?
Any authenticated WordPress user with subscriber-level access or higher can exploit it. The attacker does not need administrative privileges, but must be able to log in to the affected site.
Is a default or common deployment condition required for exploitation?
The described nonce exposure occurs when WooCommerce is inactive. In that condition, the nonce is emitted inline on admin pages accessible to subscriber-level users, allowing them to obtain it and trigger the unauthorized plugin installation.
What can an attacker do after exploiting it?
An attacker can install and activate an arbitrary plugin hosted by the attacker. This can result in remote code execution on the WordPress server.
How can I determine whether my site is affected?
Sites using Checkout Custom Fields Builder for WooCommerce version 1.1.5 or earlier are affected according to the provided information. Exposure is specifically described when WooCommerce is inactive and subscriber-level accounts can access WordPress admin pages.