Directory traversal vulnerability in memcp.php in XMB (Extreme Message Board) 1.9.6 and earlier allows remote attackers to include and execute arbitrary local files via directory traversal sequences in the langfilenew parameter, as demonstrated by injecting PHP sequences into an Apache HTTP Server log file, which is then included by header.php.
https://www.exploit-db.com/exploits/2178
https://exchange.xforce.ibmcloud.com/vulnerabilities/28356
https://docs.xmbforum2.com/index.php?title=Security_Issue_History
http://www.securityfocus.com/bid/19494
http://www.securityfocus.com/archive/1/443167/100/0/threaded