diff --git a/wp-includes/comment-template.php b/wp-includes/comment-template.php
index 29b102a207..09969c81da 100644
--- a/wp-includes/comment-template.php
+++ b/wp-includes/comment-template.php
@@ -2065,6 +2065,7 @@ function wp_list_comments( $args = array(), $comments = null ) {
  *              'cancel_reply_before', and 'cancel_reply_after' arguments.
  * @since 4.5.0 The 'author', 'email', and 'url' form fields are limited to 245, 100,
  *              and 200 characters, respectively.
+ * @since 4.6.0 Introduced the 'action' argument.
  *
  * @param array       $args {
  *     Optional. Default arguments and form fields to override.
@@ -2083,6 +2084,7 @@ function wp_list_comments( $args = array(), $comments = null ) {
  *                                        if the user is not logged in.
  *                                        Default 'Your email address will not be published.'.
  *     @type string $comment_notes_after  HTML element for a message displayed after the textarea field.
+ *     @type string $action               The comment form element action attribute. Default '/wp-comments-post.php'.
  *     @type string $id_form              The comment form element id attribute. Default 'commentform'.
  *     @type string $id_submit            The comment submit element id attribute. Default 'submit'.
  *     @type string $class_form           The comment form element class attribute. Default 'comment-form'.
@@ -2164,6 +2166,7 @@ function comment_form( $args = array(), $post_id = null ) {
 		                          ) . '</p>',
 		'comment_notes_before' => '<p class="comment-notes"><span id="email-notes">' . __( 'Your email address will not be published.' ) . '</span>'. ( $req ? $required_text : '' ) . '</p>',
 		'comment_notes_after'  => '',
+		'action'               => site_url( '/wp-comments-post.php' ),
 		'id_form'              => 'commentform',
 		'id_submit'            => 'submit',
 		'class_form'           => 'comment-form',
@@ -2228,7 +2231,7 @@ 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.
diff --git a/wp-includes/version.php b/wp-includes/version.php
index cc7b81de34..7497de9b3c 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.6-alpha-37207';
+$wp_version = '4.6-alpha-37208';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.