--- sidebar/tplfn_sidebar.php~	2010-03-22 19:53:07.000000000 +0200
+++ sidebar/tplfn_sidebar.php	2010-03-22 19:54:26.889836553 +0200
@@ -73,6 +73,9 @@
     $fileSidebar = getSidebarFN(getNS($ID), tpl_getConf('page'));
   }
 
+  // check user has read permission for the sidebar page
+  if (auth_quickaclcheck($fileSidebar) < AUTH_READ) return;
+
   // determine what to display
   if ($fileSidebar) {
     $ID = $fileSidebar;