Forbes article with my comment:
http://onforb.es/MI6fDt
Company blog entry with the breach description:
http://blog.whmcs.com/?t=47650
WHMCS website:
http://www.whmcs.com
The company blog entry about the social engineering attack scenario:
http://blog.whmcs.com/?t=47660
The stolen data was posted here:
http://pastebin.com/tttTntmf