The getObjectByToken function in Newsletter.php in the Pimcore_Tool_Newsletter module in pimcore 1.4.9 through 2.1.0 does not properly handle an object obtained by unserializing a pathname, which allows remote attackers to conduct PHP object injection attacks and delete arbitrary files via vectors involving a Zend_Http_Response_Stream object.
Improper Input Validation 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.