delpm.php in PBLang 4.63 allows remote authenticated users to delete arbitrary PM files by modifying the "id" and "a" parameters.
https://exchange.xforce.ibmcloud.com/vulnerabilities/19552
https://euvd.enisa.europa.eu/vulnerability/EUVD-2005-0632
http://www.securityfocus.com/bid/12694
http://pblforum.drmartinus.de/post.php?cat=2&fid=2&pid=42&page=1