Index: src/wp-admin/includes/class-wp-comments-list-table.php
===================================================================
--- src/wp-admin/includes/class-wp-comments-list-table.php	(revision 51948)
+++ src/wp-admin/includes/class-wp-comments-list-table.php	(working copy)
@@ -947,7 +947,8 @@
 		echo '</strong><br />';
 
 		if ( ! empty( $author_url_display ) ) {
-			printf( '<a href="%s">%s</a><br />', esc_url( $author_url ), esc_html( $author_url_display ) );
+			// Print link to author URL, and disallow referrer information (without using target="_blank").
+			printf( '<a href="%s" rel="noopener noreferrer">%s</a><br />', esc_url( $author_url ), esc_html( $author_url_display ) );
 		}
 
 		if ( $this->user_can ) {