Index: /controller/wpsg_ShopController.class.php
===================================================================
--- /controller/wpsg_ShopController.class.php	(revision 8251)
+++ /controller/wpsg_ShopController.class.php	(revision 8252)
@@ -2414,5 +2414,5 @@
 			}
 			
-			if (isset($_REQUEST['set_product_key'])) {
+			if (isset($_REQUEST['set_product_key']) && preg_match('/^pv_'.preg_quote($produkt_id).'\|/', $_REQUEST['set_product_key'])) {
 				
 				// ?set_product_key=pv_{product_id}|{variant_id}:{variation_id}