Ticket #4663: 4663.diff

wp-admin/options.php

@@ -38 +38 @@
 
         $referred = remove_query_arg('updated' , wp_get_referer());
         $goback = add_query_arg('updated', 'true', wp_get_referer());
-        $goback = preg_replace('|[^a-z0-9-~+_.?#=&;,/:]|i', '', $goback);
+        $goback = preg_replace('|[^a-z0-9-~+_.?#=&;,/:%]|i', '', $goback);
         wp_redirect($goback);
     break;