Index: includes/pager.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/pager.inc,v
retrieving revision 1.59
diff -u -p -r1.59 pager.inc
--- includes/pager.inc	15 Oct 2006 19:57:05 -0000	1.59
+++ includes/pager.inc	1 Jul 2009 20:54:45 -0000
@@ -85,7 +85,7 @@ function pager_query($query, $limit = 10
 function pager_get_querystring() {
   static $string = NULL;
   if (!isset($string)) {
-    $string = drupal_query_string_encode($_REQUEST, array_merge(array('q', 'page'), array_keys($_COOKIE)));
+    $string = drupal_query_string_encode($_REQUEST, array_merge(array('q', 'page', 'pass'), array_keys($_COOKIE)));
   }
   return $string;
 }
Index: includes/tablesort.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/tablesort.inc,v
retrieving revision 1.43.2.1
diff -u -p -r1.43.2.1 tablesort.inc
--- includes/tablesort.inc	16 Jun 2007 22:29:25 -0000	1.43.2.1
+++ includes/tablesort.inc	1 Jul 2009 20:54:46 -0000
@@ -131,7 +131,7 @@ function tablesort_cell($cell, $header, 
  *   except for those pertaining to table sorting.
  */
 function tablesort_get_querystring() {
-  return drupal_query_string_encode($_REQUEST, array_merge(array('q', 'sort', 'order'), array_keys($_COOKIE)));
+  return drupal_query_string_encode($_REQUEST, array_merge(array('q', 'sort', 'order', 'pass'), array_keys($_COOKIE)));
 }
 
 /**
Index: modules/forum/forum.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/forum/forum.module,v
retrieving revision 1.375.2.8
diff -u -p -r1.375.2.8 forum.module
--- modules/forum/forum.module	29 Apr 2009 18:53:38 -0000	1.375.2.8
+++ modules/forum/forum.module	1 Jul 2009 20:54:46 -0000
@@ -833,6 +833,11 @@ function _forum_new($tid) {
  * Menu callback; prints a forum listing.
  */
 function forum_page($tid = 0) {
+  if (!is_numeric($tid)) {
+    return MENU_NOT_FOUND;
+  }
+  $tid = (int)$tid;
+
   drupal_add_css(drupal_get_path('module', 'forum') .'/forum.css');
   $forum_per_page = variable_get('forum_per_page', 25);
   $sortby = variable_get('forum_order', 1);