Scriptsez Smart PHP Subscriber (aka subscribe) stores sensitive information under the web root with insufficient access control, which allows remote attackers to obtain encoded passwords via a direct request for pwd.txt.
https://exchange.xforce.ibmcloud.com/vulnerabilities/31701
http://www.securityfocus.com/archive/1/457852/100/0/threaded
http://securityreason.com/securityalert/2183