diff --git a/main/exercice/exercise_history.php b/main/exercice/exercise_history.php
index 9d2fb316cd..23bda2a92b 100755
--- a/main/exercice/exercise_history.php
+++ b/main/exercice/exercise_history.php
@@ -25,9 +25,9 @@ if (!$is_allowedToEdit){
     exit;
 }
 
-$interbreadcrumb[]= array ('url' => 'exercise_report.php','name' => get_lang('Exercises'));
-$interbreadcrumb[]= array ('url' => 'exercise_report.php'.'?filter=2','name' => get_lang('StudentScore'));
-$interbreadcrumb[]= array ('url' => 'exercise_history.php'.'?exe_id='.intval($_GET['exe_id']), 'name' => get_lang('Details'));
+$interbreadcrumb[]= array ('url' => 'exercise_report.php?'.api_get_cidreq(),'name' => get_lang('Exercises'));
+$interbreadcrumb[]= array ('url' => 'exercise_report.php?filter=2&'.api_get_cidreq(),'name' => get_lang('StudentScore'));
+$interbreadcrumb[]= array ('url' => 'exercise_history.php?exe_id='.intval($_GET['exe_id']).'&'.api_get_cidreq(), 'name' => get_lang('Details'));
 
 $TBL_USER          	    = Database::get_main_table(TABLE_MAIN_USER);
 $TBL_EXERCISES			= Database::get_course_table(TABLE_QUIZ_TEST);
@@ -43,7 +43,8 @@ if (isset($_GET['message'])) {
 }
 
 echo '<div class="actions">';
-echo '<a href="exercise_report.php?' . api_get_cidreq() . '&filter=2">' . Display :: return_icon('back.png', get_lang('BackToResultList'),'',ICON_SIZE_MEDIUM).'</a>';
+echo '<a href="exercise_report.php?' . api_get_cidreq() . '&filter=2">' .
+    Display :: return_icon('back.png', get_lang('BackToResultList'),'',ICON_SIZE_MEDIUM).'</a>';
 echo '</div>';
 
 ?>
diff --git a/main/exercice/exercise_report.php b/main/exercice/exercise_report.php
index e47108e7e3..0094e14bce 100755
--- a/main/exercice/exercise_report.php
+++ b/main/exercice/exercise_report.php
@@ -289,7 +289,7 @@ if (($is_allowedToEdit || $is_tutor || api_is_coach()) &&
         Database::query($sql);
         $sql = 'DELETE FROM '.$TBL_TRACK_ATTEMPT.' WHERE exe_id = '.$exe_id;
         Database::query($sql);
-        header('Location: exercise_report.php?cidReq='.Security::remove_XSS($_GET['cidReq']).'&exerciseId='.$exercise_id);
+        header('Location: exercise_report.php?'.api_get_cidreq().'&exerciseId='.$exercise_id);
         exit;
     }
 }
@@ -623,7 +623,7 @@ $extra_params['height'] = 'auto';
             });
         });
 </script>
-<form id="export_report_form" method="post" action="exercise_report.php">
+<form id="export_report_form" method="post" action="exercise_report.php?<?php echo api_get_cidreq(); ?>">
     <input type="hidden" name="csvBuffer" id="csvBuffer" value="" />
     <input type="hidden" name="export_report" id="export_report" value="1" />
     <input type="hidden" name="exerciseId" id="exerciseId" value="<?php echo $exercise_id ?>" />
diff --git a/main/exercice/live_stats.php b/main/exercice/live_stats.php
index 6b19cb8731..47039bd60c 100755
--- a/main/exercice/live_stats.php
+++ b/main/exercice/live_stats.php
@@ -76,7 +76,8 @@ $(function() {
 </script>
 <?php
 
-$actions = '<a href="exercise_report.php?exerciseId='.intval($_GET['exerciseId']).'">' . Display :: return_icon('back.png', get_lang('GoBackToQuestionList'),'',ICON_SIZE_MEDIUM).'</a>';
+$actions = '<a href="exercise_report.php?exerciseId='.intval($_GET['exerciseId']).'&'.api_get_cidreq().'">' .
+    Display :: return_icon('back.png', get_lang('GoBackToQuestionList'),'',ICON_SIZE_MEDIUM).'</a>';
 echo $actions = Display::div($actions, array('class'=> 'actions'));
 
 //echo Display::page_header($objExercise->name);
diff --git a/main/exercice/stats.php b/main/exercice/stats.php
index b1dda2439e..713347e0bf 100755
--- a/main/exercice/stats.php
+++ b/main/exercice/stats.php
@@ -276,8 +276,8 @@ foreach ($data as $row_table) {
 $content .= $table->toHtml();
 
 
-$interbreadcrumb[] = array ("url" => "exercise.php?gradebook=$gradebook", "name" => get_lang('Exercises'));
-$interbreadcrumb[] = array ("url" => "admin.php?exerciseId=$exercise_id","name" => $objExercise->name);
+$interbreadcrumb[] = array("url" => "exercise.php?gradebook=$gradebook&".api_get_cidreq(), "name" => get_lang('Exercises'));
+$interbreadcrumb[] = array("url" => "admin.php?exerciseId=$exercise_id&".api_get_cidreq(), "name" => $objExercise->name);
 
 $tpl = new Template(get_lang('ReportByQuestion'));
 
@@ -285,7 +285,7 @@ $tpl = new Template(get_lang('ReportByQuestion'));
 //$actions[]= array(get_lang('Back'), Display::return_icon('back.png', get_lang('Back'), 'exercise_report.php?'.$exercise_id));
 //$tpl->set_actions($actions);
 
-$actions = '<a href="exercise_report.php?exerciseId='.intval($_GET['exerciseId']).'">' .
+$actions = '<a href="exercise_report.php?exerciseId='.intval($_GET['exerciseId']).'&'.api_get_cidreq().'">' .
     Display :: return_icon('back.png', get_lang('GoBackToQuestionList'),'',ICON_SIZE_MEDIUM).'</a>';
 $actions = Display::div($actions, array('class'=> 'actions'));
 $content = $actions.$content;