diff --git a/htdocs/comm/action/document.php b/htdocs/comm/action/document.php
index da79ff42233..88fa0f440ea 100755
--- a/htdocs/comm/action/document.php
+++ b/htdocs/comm/action/document.php
@@ -2,7 +2,7 @@
 /* Copyright (C) 2003-2004 Rodolphe Quiedeville  <rodolphe@quiedeville.org>
  * Copyright (C) 2004-2010 Laurent Destailleur   <eldy@users.sourceforge.net>
  * Copyright (C) 2005      Marc Barilley / Ocebo <marc@ocebo.com>
- * Copyright (C) 2005-2009 Regis Houssin         <regis@dolibarr.fr>
+ * Copyright (C) 2005-2012 Regis Houssin         <regis@dolibarr.fr>
  * Copyright (C) 2005      Simon TOSSER          <simon@kornog-computing.com>
  *
  * This program is free software; you can redistribute it and/or modify
diff --git a/htdocs/comm/action/fiche.php b/htdocs/comm/action/fiche.php
index 85bb92979bd..2951f701c77 100644
--- a/htdocs/comm/action/fiche.php
+++ b/htdocs/comm/action/fiche.php
@@ -2,7 +2,7 @@
 /* Copyright (C) 2001-2005 Rodolphe Quiedeville <rodolphe@quiedeville.org>
  * Copyright (C) 2004-2012 Laurent Destailleur  <eldy@users.sourceforge.net>
  * Copyright (C) 2005      Simon TOSSER         <simon@kornog-computing.com>
- * Copyright (C) 2005-2011 Regis Houssin        <regis@dolibarr.fr>
+ * Copyright (C) 2005-2012 Regis Houssin        <regis@dolibarr.fr>
  * Copyright (C) 2010      Juanjo Menent        <jmenent@2byte.es>
  *
  * This program is free software; you can redistribute it and/or modify
@@ -43,11 +43,12 @@ $langs->load("bills");
 $langs->load("orders");
 $langs->load("agenda");
 
-$action=GETPOST("action");
+$action=GETPOST('action','alpha');
+$backtopage=GETPOST('backtopage','alpha');
 
 // Security check
-$socid = GETPOST('socid');
-$id = GETPOST('id');
+$socid = GETPOST('socid','int');
+$id = GETPOST('id','int');
 if ($user->societe_id) $socid=$user->societe_id;
 //$result = restrictedArea($user, 'agenda', $id, 'actioncomm', 'actions', '', 'id');
 
@@ -66,9 +67,7 @@ if ($action == 'add_action')
 {
 	$error=0;
 
-    $backtopage='';
-    if (! empty($_POST["backtopage"])) $backtopage=$_POST["backtopage"];
-    if (! $backtopage)
+    if (empty($backtopage))
     {
         if ($socid > 0) $backtopage = DOL_URL_ROOT.'/societe/agenda.php?socid='.$socid;
         else $backtopage=DOL_URL_ROOT.'/comm/action/index.php';
@@ -339,14 +338,9 @@ if ($action == 'update')
 	}
 	else
 	{
-		if (! empty($_POST["from"]))  // deprecated. Use backtopage instead
-		{
-			header("Location: ".$_POST["from"]);
-			exit;
-		}
-        if (! empty($_POST["backtopage"]))
+        if (! empty($backtopage))
         {
-            header("Location: ".$_POST["backtopage"]);
+            header("Location: ".$backtopage);
             exit;
         }
 	}
@@ -426,7 +420,7 @@ if ($action == 'create')
 	print '<form name="formaction" action="'.DOL_URL_ROOT.'/comm/action/fiche.php" method="POST">';
 	print '<input type="hidden" name="token" value="'.$_SESSION['newtoken'].'">';
 	print '<input type="hidden" name="action" value="add_action">';
-	if (GETPOST("backtopage")) print '<input type="hidden" name="backtopage" value="'.(GETPOST("backtopage") != 1 ? GETPOST("backtopage") : $_SERVER["HTTP_REFERER"]).'">';
+	print '<input type="hidden" name="backtopage" value="'.(! empty($backtopage) ? $backtopage : $_SERVER["HTTP_REFERER"]).'">';
 
 	if (GETPOST("actioncode") == 'AC_RDV') print_fiche_titre($langs->trans("AddActionRendezVous"));
 	else print_fiche_titre($langs->trans("AddAnAction"));
@@ -679,7 +673,7 @@ if ($id)
 		print '<input type="hidden" name="action" value="update">';
 		print '<input type="hidden" name="id" value="'.$id.'">';
 		print '<input type="hidden" name="ref_ext" value="'.$act->ref_ext.'">';
-		if (GETPOST("backtopage")) print '<input type="hidden" name="backtopage" value="'.(GETPOST("backtopage") ? GETPOST("backtopage") : $_SERVER["HTTP_REFERER"]).'">';
+		print '<input type="hidden" name="backtopage" value="'.(! empty($backtopage) ? $backtopage : $_SERVER["HTTP_REFERER"]).'">';
 
 		print '<table class="border" width="100%">';
 
diff --git a/htdocs/comm/remise.php b/htdocs/comm/remise.php
index abfb5005972..b124a83714f 100644
--- a/htdocs/comm/remise.php
+++ b/htdocs/comm/remise.php
@@ -30,21 +30,23 @@ $langs->load("companies");
 $langs->load("orders");
 $langs->load("bills");
 
-$socid = GETPOST("id");
+$socid = GETPOST('id','int');
 // Security check
 if ($user->societe_id > 0)
 {
 	$socid = $user->societe_id;
 }
 
+$backtopage = GETPOST('backtopage','alpha');
+
 
 /*
  * Actions
  */
 
-if (GETPOST('cancel') && GETPOST('backtopage'))
+if (GETPOST('cancel') && ! empty($backtopage))
 {
-     Header("Location: ".GETPOST("backtopage"));
+     Header("Location: ".$backtopage);
      exit;
 }
 
@@ -56,9 +58,9 @@ if (GETPOST("action") == 'setremise')
 
 	if ($result > 0)
 	{
-	    if (GETPOST('backtopage'))
+	    if (! empty($backtopage))
 	    {
-    		Header("Location: ".GETPOST('backtopage'));
+    		Header("Location: ".$backtopage);
     		exit;
 	    }
 	    else
@@ -122,7 +124,7 @@ if ($socid > 0)
 	print '<form method="POST" action="remise.php?id='.$objsoc->id.'">';
 	print '<input type="hidden" name="token" value="'.$_SESSION['newtoken'].'">';
 	print '<input type="hidden" name="action" value="setremise">';
-    print '<input type="hidden" name="backtopage" value="'.GETPOST('backtopage').'">';
+    print '<input type="hidden" name="backtopage" value="'.$backtopage.'">';
 
 	print '<table class="border" width="100%">';
 
@@ -138,7 +140,7 @@ if ($socid > 0)
 
 	print '<center>';
 	print '<input type="submit" class="button" value="'.$langs->trans("Modify").'">';
-    if (GETPOST("backtopage"))
+    if (! empty($backtopage))
     {
         print '&nbsp; &nbsp; ';
 	    print '<input type="submit" class="button" name="cancel" value="'.$langs->trans("Cancel").'">';
diff --git a/htdocs/comm/remx.php b/htdocs/comm/remx.php
index 8f26a58463e..42bac50817f 100644
--- a/htdocs/comm/remx.php
+++ b/htdocs/comm/remx.php
@@ -32,7 +32,8 @@ $langs->load("orders");
 $langs->load("bills");
 $langs->load("companies");
 
-$action=GETPOST('action');
+$action=GETPOST('action','alpha');
+$backtopage=GETPOST('backtopage','alpha');
 
 // Security check
 $socid = GETPOST("id");
@@ -46,9 +47,9 @@ if ($user->societe_id > 0)
  * Actions
  */
 
-if (GETPOST('cancel') && GETPOST('backtopage'))
+if (GETPOST('cancel') && ! empty($backtopage))
 {
-     Header("Location: ".GETPOST("backtopage"));
+     Header("Location: ".$backtopage);
      exit;
 }
 
@@ -151,9 +152,9 @@ if ($action == 'setremise')
 
 			if ($discountid > 0)
 			{
-			    if (GETPOST("backtopage"))
+			    if (! empty($backtopage))
 			    {
-			        Header("Location: ".GETPOST("backtopage").'&discountid='.$discountid);
+			        Header("Location: ".$backtopage.'&discountid='.$discountid);
 			        exit;
 			    }
 				else
@@ -228,7 +229,7 @@ if ($socid > 0)
 	print '<form method="POST" action="'.$_SERVER["PHP_SELF"].'?id='.$objsoc->id.'">';
 	print '<input type="hidden" name="token" value="'.$_SESSION['newtoken'].'">';
 	print '<input type="hidden" name="action" value="setremise">';
-    print '<input type="hidden" name="backtopage" value="'.GETPOST('backtopage').'">';
+    print '<input type="hidden" name="backtopage" value="'.$backtopage.'">';
 
 	print '<table class="border" width="100%">';
 
@@ -280,7 +281,7 @@ if ($socid > 0)
 
 	print '<center>';
 	print '<input type="submit" class="button" name="submit" value="'.$langs->trans("AddGlobalDiscount").'">';
-    if (GETPOST("backtopage"))
+    if (! empty($backtopage))
     {
         print '&nbsp; &nbsp; ';
 	    print '<input type="submit" class="button" name="cancel" value="'.$langs->trans("Cancel").'">';
diff --git a/htdocs/contact/fiche.php b/htdocs/contact/fiche.php
index 213980d55a1..bb6ff79a06d 100644
--- a/htdocs/contact/fiche.php
+++ b/htdocs/contact/fiche.php
@@ -39,10 +39,11 @@ $langs->load("commercial");
 
 $mesg=''; $error=0; $errors=array();
 
-$action		= (GETPOST('action') ? GETPOST('action') : 'view');
-$confirm	= GETPOST('confirm');
-$id			= GETPOST("id");
-$socid		= GETPOST("socid");
+$action		= (GETPOST('action','alpha') ? GETPOST('action','alpha') : 'view');
+$confirm	= GETPOST('confirm','alpha');
+$backtopage = GETPOST('backtopage','alpha');
+$id			= GETPOST('id','int');
+$socid		= GETPOST('socid','int');
 if ($user->societe_id) $socid=$user->societe_id;
 
 $object = new Contact($db);
@@ -76,9 +77,9 @@ $reshook=$hookmanager->executeHooks('doActions',$parameters,$object,$action);
 if (empty($reshook))
 {
     // Cancel
-    if (GETPOST("cancel") && GETPOST('backtopage'))
+    if (GETPOST("cancel") && ! empty($backtopage))
     {
-        header("Location: ".GETPOST('backtopage'));
+        header("Location: ".$backtopage);
         exit;
     }
 
@@ -86,7 +87,7 @@ if (empty($reshook))
     if ($action == 'confirm_create_user' && $confirm == 'yes' && $user->rights->user->user->creer)
     {
         // Recuperation contact actuel
-        $result = $object->fetch($_GET["id"]);
+        $result = $object->fetch($id);
 
         if ($result > 0)
         {
@@ -172,7 +173,7 @@ if (empty($reshook))
         if (! $error && $id > 0)
         {
             $db->commit();
-            if (GETPOST('backtopage')) $url=GETPOST('backtopage');
+            if (! empty($backtopage)) $url=$backtopage;
             else $url='fiche.php?id='.$id;
             Header("Location: ".$url);
             exit;
@@ -368,7 +369,7 @@ else
             print '<form method="post" name="formsoc" action="'.$_SERVER["PHP_SELF"].'">';
             print '<input type="hidden" name="token" value="'.$_SESSION['newtoken'].'">';
             print '<input type="hidden" name="action" value="add">';
-            print '<input type="hidden" name="backtopage" value="'.GETPOST('backtopage').'">';
+            print '<input type="hidden" name="backtopage" value="'.$backtopage.'">';
             print '<table class="border" width="100%">';
 
             // Name
@@ -497,7 +498,7 @@ else
 
             print '<center>';
             print '<input type="submit" class="button" name="add" value="'.$langs->trans("Add").'">';
-            if (GETPOST('backtopage'))
+            if (! empty($backtopage))
             {
                 print ' &nbsp; &nbsp; ';
                 print '<input type="submit" class="button" name="cancel" value="'.$langs->trans("Cancel").'">';
@@ -537,11 +538,11 @@ else
                 print '</script>';
             }
 
-            print '<form method="post" action="'.$_SERVER["PHP_SELF"].'?id='.GETPOST("id").'" name="formsoc">';
+            print '<form method="post" action="'.$_SERVER["PHP_SELF"].'?id='.$id.'" name="formsoc">';
             print '<input type="hidden" name="token" value="'.$_SESSION['newtoken'].'">';
-            print '<input type="hidden" name="id" value="'.GETPOST("id").'">';
+            print '<input type="hidden" name="id" value="'.$id.'">';
             print '<input type="hidden" name="action" value="update">';
-            print '<input type="hidden" name="backtopage" value="'.GETPOST('backtopage').'">';
+            print '<input type="hidden" name="backtopage" value="'.$backtopage.'">';
             print '<input type="hidden" name="contactid" value="'.$object->id.'">';
             print '<input type="hidden" name="old_name" value="'.$object->name.'">';
             print '<input type="hidden" name="old_firstname" value="'.$object->firstname.'">';
diff --git a/htdocs/core/lib/functions.lib.php b/htdocs/core/lib/functions.lib.php
index f9836b4165a..5dfcda5ab17 100644
--- a/htdocs/core/lib/functions.lib.php
+++ b/htdocs/core/lib/functions.lib.php
@@ -257,7 +257,11 @@ function GETPOST($paramname,$check='',$method=0)
 		// Check if alpha
 		//if ($check == 'alpha' && ! preg_match('/^[ =:@#\/\\\(\)\-\._a-z0-9]+$/i',trim($out))) $out='';
 		// '"' is dangerous because param in url can close the href= or src= and add javascript functions.
-		if ($check == 'alpha' && preg_match('/"/',trim($out))) $out='';
+		if ($check == 'alpha')
+		{
+			if (preg_match('/"/',trim($out))) $out='';
+			else if (preg_match('/(\.\.\/)+/',trim($out))) $out='';
+		}
 	}
 
 	return $out;
diff --git a/htdocs/document.php b/htdocs/document.php
index 9c59f1da051..8836ebdbf97 100644
--- a/htdocs/document.php
+++ b/htdocs/document.php
@@ -2,7 +2,7 @@
 /* Copyright (C) 2004-2007 Rodolphe Quiedeville <rodolphe@quiedeville.org>
  * Copyright (C) 2004-2012 Laurent Destailleur  <eldy@users.sourceforge.net>
  * Copyright (C) 2005      Simon Tosser         <simon@kornog-computing.com>
- * Copyright (C) 2005-2011 Regis Houssin        <regis@dolibarr.fr>
+ * Copyright (C) 2005-2012 Regis Houssin        <regis@dolibarr.fr>
  * Copyright (C) 2010	   Pierre Morin         <pierre.morin@auguria.net>
  * Copyright (C) 2010	   Juanjo Menent        <jmenent@2byte.es>
  *
@@ -50,10 +50,10 @@ require("./main.inc.php");	// Load $user and permissions
 require_once(DOL_DOCUMENT_ROOT.'/core/lib/files.lib.php');
 
 $encoding = '';
-$action = GETPOST("action");
-$original_file = GETPOST("file");	// Do not use urldecode here ($_GET are already decoded by PHP).
-$modulepart = GETPOST("modulepart");
-$urlsource = GETPOST("urlsource");
+$action = GETPOST('action','alpha');
+$original_file = GETPOST('file','alpha');	// Do not use urldecode here ($_GET are already decoded by PHP).
+$modulepart = GETPOST('modulepart','alpha');
+$urlsource = GETPOST('urlsource','alpha');
 
 // Security check
 if (empty($modulepart)) accessforbidden('Bad value for parameter modulepart');
@@ -72,7 +72,7 @@ if (empty($modulepart)) accessforbidden('Bad value for parameter modulepart');
 
 // Define mime type
 $type = 'application/octet-stream';
-if (GETPOST('type')) $type=GETPOST('type');
+if (GETPOST('type','alpha')) $type=GETPOST('type','alpha');
 else $type=dol_mimetype($original_file);
 //print 'X'.$type.'-'.$original_file;exit;
 
diff --git a/htdocs/projet/fiche.php b/htdocs/projet/fiche.php
index 95aba87efb0..371028f02fd 100644
--- a/htdocs/projet/fiche.php
+++ b/htdocs/projet/fiche.php
@@ -34,8 +34,9 @@ $langs->load("projects");
 $langs->load('companies');
 
 $id=GETPOST('id','int');
-$ref = GETPOST('ref');
-$action=GETPOST('action');
+$ref = GETPOST('ref','alpha');
+$action=GETPOST('action','alpha');
+$backtopage=GETPOST('backtopage','alpha');
 
 if ($id == '' && $ref == '' && ($action != "create" && $action != "add" && $action != "update" && ! $_POST["cancel"])) accessforbidden();
 
@@ -55,9 +56,9 @@ $result = restrictedArea($user, 'projet', $id);
  */
 
 // Cancel
-if (GETPOST("cancel") && GETPOST('backtopage'))
+if (GETPOST("cancel") && ! empty($backtopage))
 {
-    header("Location: ".GETPOST('backtopage'));
+    header("Location: ".$backtopage);
     exit;
 }
 
@@ -276,7 +277,7 @@ if ($action == 'create' && $user->rights->projet->creer)
     print '<form action="'.$_SERVER["PHP_SELF"].'" method="POST">';
     print '<input type="hidden" name="token" value="'.$_SESSION['newtoken'].'">';
     print '<input type="hidden" name="action" value="add">';
-    print '<input type="hidden" name="backtopage" value="'.GETPOST('backtopage').'">';
+    print '<input type="hidden" name="backtopage" value="'.$backtopage.'">';
 
     print '<table class="border" width="100%">';
 
@@ -332,7 +333,7 @@ if ($action == 'create' && $user->rights->projet->creer)
 
     print '<br><center>';
     print '<input type="submit" class="button" value="'.$langs->trans("Create").'">';
-    if (GETPOST('backtopage'))
+    if (! empty($backtopage))
     {
         print ' &nbsp; &nbsp; ';
 	    print '<input type="submit" class="button" name="cancel" value="'.$langs->trans("Cancel").'">';
diff --git a/htdocs/projet/tasks.php b/htdocs/projet/tasks.php
index c05bac91f4e..6c4ccb733fa 100644
--- a/htdocs/projet/tasks.php
+++ b/htdocs/projet/tasks.php
@@ -36,6 +36,7 @@ $langs->load("projects");
 $action = GETPOST('action', 'alpha');
 $id = GETPOST('id', 'int');
 $ref = GETPOST('ref', 'alpha');
+$backtopage=GETPOST('backtopage','alpha');
 
 $mode = GETPOST('mode', 'alpha');
 $mine = ($mode == 'mine' ? 1 : 0);
@@ -111,9 +112,9 @@ if ($action == 'createtask' && $user->rights->projet->creer)
 
 		if (! $error)
 		{
-		    if (GETPOST('backtopage'))
+		    if (! empty($backtopage))
 			{
-				Header("Location: ".GETPOST('backtopage'));
+				Header("Location: ".$backtopage);
 				exit;
 			}
 			else if (empty($projectid))
@@ -125,9 +126,9 @@ if ($action == 'createtask' && $user->rights->projet->creer)
 	}
 	else
 	{
-		if (GETPOST('backtopage'))
+		if (! empty($backtopage))
 		{
-			Header("Location: ".GETPOST('backtopage'));
+			Header("Location: ".$backtopage);
 			exit;
 		}
 	    else if (empty($id))
@@ -219,7 +220,7 @@ if ($action == 'create' && $user->rights->projet->creer && (empty($object->socie
 	print '<form action="'.$_SERVER['PHP_SELF'].'" method="POST">';
 	print '<input type="hidden" name="token" value="'.$_SESSION['newtoken'].'">';
 	print '<input type="hidden" name="action" value="createtask">';
-	print '<input type="hidden" name="backtopage" value="'.GETPOST('backtopage').'">';
+	print '<input type="hidden" name="backtopage" value="'.$backtopage.'">';
 	if (! empty($object->id)) print '<input type="hidden" name="id" value="'.$object->id.'">';
 	if (! empty($mode)) print '<input type="hidden" name="mode" value="'.$mode.'">';
 
diff --git a/htdocs/public/members/new.php b/htdocs/public/members/new.php
index fc7feedb0ae..d1d63d0310e 100644
--- a/htdocs/public/members/new.php
+++ b/htdocs/public/members/new.php
@@ -47,8 +47,8 @@ require_once(DOL_DOCUMENT_ROOT."/core/lib/company.lib.php");
 $errmsg='';
 $num=0;
 $error=0;
-$backtopage=GETPOST('backtopage');
-$action=GETPOST('action');
+$backtopage=GETPOST('backtopage','alpha');
+$action=GETPOST('action','alpha');
 
 // Load translation files
 $langs->load("main");
@@ -255,7 +255,7 @@ if ($action == 'add')
                 $result=$adh->send_an_email($conf->global->ADHERENT_AUTOREGISTER_MAIL,$conf->global->ADHERENT_AUTOREGISTER_MAIL_SUBJECT,array(),array(),array(),"","",0,-1);
             }
 
-            if ($backtopage) $urlback=$backtopage;
+            if (! empty($backtopage)) $urlback=$backtopage;
             else if ($conf->global->MEMBER_URL_REDIRECT_SUBSCRIPTION)
             {
                 $urlback=$conf->global->MEMBER_URL_REDIRECT_SUBSCRIPTION;
@@ -545,7 +545,7 @@ print "</table>\n";
 // Save
 print '<br><center>';
 print '<input type="submit" value="'.$langs->trans("Save").'" id="submitsave" class="button">';
-if ($backtopage)
+if (! empty($backtopage))
 {
     print ' &nbsp; &nbsp; <input type="submit" value="'.$langs->trans("Cancel").'" id="submitcancel" class="button">';
 }