diff --git a/cis/testtool/login.php b/cis/testtool/login.php
index e42a623b2..477901803 100644
--- a/cis/testtool/login.php
+++ b/cis/testtool/login.php
@@ -125,6 +125,9 @@ if (isset($_POST['prestudent']) && isset($gebdatum))
 		{
 			if($rt->freigeschaltet)
 			{
+				// regenerate Session ID after Login
+				session_regenerate_id();
+
 				$pruefling = new pruefling();
 				if($pruefling->getPruefling($ps->prestudent_id))
 				{