The AddToMailingList function in CactuSoft CactuShop 5.0 Lite contains a backdoor that allows remote attackers to delete arbitrary files via an email address that starts with |||.
https://exchange.xforce.ibmcloud.com/vulnerabilities/15063
http://www.securityfocus.com/bid/9589
http://marc.info/?l=bugtraq&m=107619501815888&w=2
http://lists.grok.org.uk/pipermail/full-disclosure/2004-February/016819.html