Directory traversal vulnerability in the bitrix.mpbuilder module before 1.0.12 for Bitrix allows remote administrators to include and execute arbitrary local files via a .. (dot dot) in the element name of the "work" array parameter to admin/bitrix.mpbuilder_step2.php.
https://www.exploit-db.com/exploits/38975/
https://marketplace.1c-bitrix.ru/solutions/bitrix.mpbuilder/#tab-log-link
http://www.securityfocus.com/archive/1/537067/100/0/threaded