Comments: Add `noopener noreferrer` to author links in list table.

When viewing the listing of all comments, author links previously passed referrer information to untrusted URLs.  This change adds `noreferrer` to each author link, as well as `noopener` to prevent the passing of information about the parent window.

Props cybr, adam3128, erayalakese, andraganescu, audrasjb, joedolson, sabernhardt. 
Fixes #40916.
Built from https://develop.svn.wordpress.org/trunk@52007


git-svn-id: http://core.svn.wordpress.org/trunk@51596 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/class-wp-comments-list-table.php

@@ -947,7 +947,12 @@ class WP_Comments_List_Table extends WP_List_Table {
 		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 ) {

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.9-alpha-52006';
+$wp_version = '5.9-alpha-52007';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.