Index: includes/bootstrap.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/bootstrap.inc,v
retrieving revision 1.206.2.11
diff -u -p -r1.206.2.11 bootstrap.inc
--- includes/bootstrap.inc	25 Feb 2009 13:49:54 -0000	1.206.2.11
+++ includes/bootstrap.inc	13 Mar 2009 21:15:50 -0000
@@ -791,6 +791,8 @@ function request_uri() {
       $uri = $_SERVER['SCRIPT_NAME'];
     }
   }
+  // Prevent multiple slashes to avoid cross site requests via the FAPI.
+  $uri = '/'. ltrim($uri, '/');
 
   return $uri;
 }