Directory traversal vulnerability in login.php in OneOrZero Helpdesk 1.6.5.7 and earlier allows remote attackers to read arbitrary files via a .. (dot dot) in the default_language parameter.
https://www.exploit-db.com/exploits/8169
https://www.exploit-db.com/exploits/8168
https://exchange.xforce.ibmcloud.com/vulnerabilities/49114