	public function execute(&$params) {
        $listIdentifier=$this->parseOption('listId',$params);
        if(is_numeric($listIdentifier)){
            $list = CActiveRecord::model('X2List')->findByPk($listIdentifier);
        }else{
            $list = CActiveRecord::model('X2List')->findByAttributes(
                array('name'=>$listIdentifier));
        }

		if($list !== null && $list->modelName === get_class($params['model'])) {
			if ($list->addIds($params['model']->id)) {
                return array (true, "");
            }
		} 
        return array (false, "");
	}
The product receives input or data, but it does
        not validate or incorrectly validates that the input has the
        properties that are required to process the data safely and
        correctly.