Germanized for WooCommerce < 3.20.6 - Unauthenticated Arbitrary Shortcode Execution

Description

The The Germanized for WooCommerce plugin for WordPress is vulnerable to arbitrary shortcode execution via 'account_holder' parameter in all versions up to, and including, 3.20.5. This is due to the software allowing users to execute an action that does not properly validate a value before running do_shortcode. This makes it possible for unauthenticated attackers to execute arbitrary shortcodes.