Index: src/wp-admin/ms-delete-site.php
===================================================================
--- src/wp-admin/ms-delete-site.php	(revision 38029)
+++ src/wp-admin/ms-delete-site.php	(working copy)
@@ -16,7 +16,7 @@
 	wp_die(__( 'Sorry, you are not allowed to delete this site.'));
 
 if ( isset( $_GET['h'] ) && $_GET['h'] != '' && get_option( 'delete_blog_hash' ) != false ) {
-	if ( get_option( 'delete_blog_hash' ) == $_GET['h'] ) {
+	if ( hash_equals( get_option( 'delete_blog_hash' ), $_GET['h'] ) ) {
 		wpmu_delete_blog( $wpdb->blogid );
 		wp_die( sprintf( __( 'Thank you for using %s, your site has been deleted. Happy trails to you until we meet again.' ), $current_site->site_name ) );
 	} else {
Index: src/wp-admin/options.php
===================================================================
--- src/wp-admin/options.php	(revision 38029)
+++ src/wp-admin/options.php	(working copy)
@@ -57,7 +57,7 @@
 	if ( ! empty($_GET[ 'adminhash' ] ) ) {
 		$new_admin_details = get_option( 'adminhash' );
 		$redirect = 'options-general.php?updated=false';
-		if ( is_array( $new_admin_details ) && $new_admin_details[ 'hash' ] == $_GET[ 'adminhash' ] && !empty($new_admin_details[ 'newemail' ]) ) {
+		if ( is_array( $new_admin_details ) && hash_equals( $new_admin_details[ 'hash' ], $_GET[ 'adminhash' ] ) && !empty($new_admin_details[ 'newemail' ]) ) {
 			update_option( 'admin_email', $new_admin_details[ 'newemail' ] );
 			delete_option( 'adminhash' );
 			delete_option( 'new_admin_email' );