PHP remote file inclusion vulnerability in articles/article.php in Yet Another Community System (YACS) CMS 6.6.1 and earlier allows remote attackers to execute arbitrary PHP code via a URL in the context[path_to_root] parameter.
https://www.exploit-db.com/exploits/2282
https://exchange.xforce.ibmcloud.com/vulnerabilities/28682
http://www.yetanothercommunitysystem.com/yacs/articles/view.php/1664