    public function beforeExecute () {
        if (!(Yii::app()->controller instanceof EmailInboxesController)) {
            throw new CHttpException (400, Yii::t('app', 'Invalid controller') );
        }
    }
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.