SQL injection vulnerability in models/Cart66Ajax.php in the Cart66 Lite plugin before 1.5.4 for WordPress allows remote authenticated users to execute arbitrary SQL commands via the q parameter in a promotionProductSearch action to wp-admin/admin-ajax.php.
https://wordpress.org/plugins/cart66-lite/changelog/
https://plugins.trac.wordpress.org/changeset/1052064/cart66-lite