Directory traversal vulnerability in user/index.php in Fonality trixbox CE 2.6.1 and earlier allows remote attackers to include and execute arbitrary files via a .. (dot dot) in the langChoice parameter.
https://www.exploit-db.com/exploits/6026
https://exchange.xforce.ibmcloud.com/vulnerabilities/43686
http://archives.neohapsis.com/archives/fulldisclosure/2008-07/0101.html