The Clockwork SMS clockwork-test-message.php component has XSS via a crafted \to\ parameter in a clockwork-test-message request to wp-admin/admin.php. This component code is found in the following WordPress plugins: Clockwork Free and Paid SMS Notifications 2.0.3 Two-Factor Authentication - Clockwork SMS 1.0.2 Booking Calendar - Clockwork SMS 1.0.5 Contact Form 7 - Clockwork SMS 2.3.0 Fast Secure Contact Form - Clockwork SMS 2.1.2 Formidable - Clockwork SMS 1.0.2 Gravity Forms - Clockwork SMS 2.2 and WP e-Commerce - Clockwork SMS 2.0.5.