sendpm.php in PBLang 4.63 allows remote authenticated users to read arbitrary files via a full pathname in the orig parameter.
https://exchange.xforce.ibmcloud.com/vulnerabilities/19544
https://euvd.enisa.europa.eu/vulnerability/EUVD-2005-0631
http://www.securityfocus.com/bid/12690
http://pblforum.drmartinus.de/post.php?cat=2&fid=2&pid=40&page=1