The Cubecart::basket method in classes/cubecart.class.php in CubeCart 5.0.0 through 5.2.0 allows remote attackers to unserialize arbitrary PHP objects via a crafted shipping parameter, as demonstrated by modifying the application configuration using the Config object.
Session fixation vulnerability in CubeCart before 5.2.9 allows remote attackers to hijack web sessions via the PHPSESSID parameter.