Directory traversal vulnerability in index.php for Wikepage 2006.2a Opus 10 allows remote attackers to include arbitrary local files via the lng parameter, as demonstrated by inserting PHP code into a log file.
https://www.exploit-db.com/exploits/2252
https://exchange.xforce.ibmcloud.com/vulnerabilities/28555
http://www.vupen.com/english/advisories/2006/3386