Index: class-wp-comments-list-table.php
===================================================================
--- class-wp-comments-list-table.php	(revision 40877)
+++ class-wp-comments-list-table.php	(working copy)
@@ -676,6 +676,8 @@
 	public function column_author( $comment ) {
 		global $comment_status;
 
+		$the_comment_class = wp_get_comment_status( $comment );
+
 		$author_url = get_comment_author_url( $comment );
 
 		$author_url_display = untrailingslashit( preg_replace( '|^http(s)?://(www\.)?|i', '', $author_url ) );
@@ -685,7 +687,11 @@
 
 		echo "<strong>"; comment_author( $comment ); echo '</strong><br />';
 		if ( ! empty( $author_url_display ) ) {
-			printf( '<a href="%s">%s</a><br />', esc_url( $author_url ), esc_html( $author_url_display ) );
+			if('approved' === $the_comment_class) {
+				printf( '<a href="%s">%s</a><br />', esc_url( $author_url ), esc_html( $author_url_display ) );
+			} else {
+				printf( '<a href="%s" rel="noreferrer">%s</a><br />', esc_url( $author_url ), esc_html( $author_url_display ) );
+			}
 		}
 
 		if ( $this->user_can ) {