A hacker has stolen tens of millions of accounts from over a thousand popular forums, which host popular car, tech, and sports communities. The stolen database contains close to 45 million records from 1,100 websites and forums hosted by VerticalScope, a Toronto-based media company with dozens of major properties, including forums and sites run by AutoGuide.com, PetGuide.com, and TopHosts.com. "We are aware of the possible issue and our internal security team has been investigating and will be collecting information to provide to the appropriate law enforcement agencies," said Jerry Orban, vice-president of corporate development, in an email. In a sample given to ZDNet, the database shows email addresses, passwords that were hashed and salted passwords with MD5 (an algorithm that nowadays is easy to crack), as well as a user's IP address (which in some cases can determine location), and the site that the record was taken from. LeakedSource, which confirmed the findings, said in its blog post that it was "likely that VerticalScope stored all of their data on interconnected or even the same servers as there is no other way to explain a theft on such a large scale." A LeakedSource group member said it was "not related" to the recent hacks against MySpace, LinkedIn, and Tumblr.
The report goes on to say: "A cursory search of the list of domains caught up in the hack revealed that none of the sites [ZDNet] checked offered basic HTTPS website encryption, which would prevent usernames and passwords from being intercepted."
tl:dr MD5 hashes are like trying to break into your kids room when your kid says there is a password. you just turn the knob and the door opens to junior eating contraband cookies.
45 million records puts this breach at the 6th largest of all time.
edit 2: Got ahold of someone at VS regarding it. He responding in seconds about it and seemed genuinely surprised we weren't informed.