diff --git wp-includes/comment-template.php wp-includes/comment-template.php
index ad5b9ca..c472b76 100644
--- wp-includes/comment-template.php
+++ wp-includes/comment-template.php
@@ -2187,6 +2187,7 @@ function comment_form( $args = array(), $post_id = null ) {
 		'submit_button'        => '<input name="%1$s" type="submit" id="%2$s" class="%3$s" value="%4$s" />',
 		'submit_field'         => '<p class="form-submit">%1$s %2$s</p>',
 		'format'               => 'xhtml',
+		'action'               => site_url( '/wp-comments-post.php' )
 	);
 
 	/**
@@ -2235,7 +2236,7 @@ function comment_form( $args = array(), $post_id = null ) {
 				 */
 				do_action( 'comment_form_must_log_in_after' );
 			else : ?>
-				<form action="<?php echo site_url( '/wp-comments-post.php' ); ?>" method="post" id="<?php echo esc_attr( $args['id_form'] ); ?>" class="<?php echo esc_attr( $args['class_form'] ); ?>"<?php echo $html5 ? ' novalidate' : ''; ?>>
+				<form action="<?php echo esc_url( $args['action'] ); ?>" method="post" id="<?php echo esc_attr( $args['id_form'] ); ?>" class="<?php echo esc_attr( $args['class_form'] ); ?>"<?php echo $html5 ? ' novalidate' : ''; ?>>
 					<?php
 					/**
 					 * Fires at the top of the comment form, inside the form tag.