A few weeks ago, Tumblr notified users of a data breach that resulted in the theft of user email addresses and hashed passwords. The company did not say how many accounts were affected, but recently someone put the data up for sale and the number is: 65 million records.
The data is being sold on a Tor dark market website called TheRealDeal by a user named peace_of_mind who also sold 167 million user records stolen from LinkedIn. Recently he also posted offers for 360 million accounts allegedly stolen from MySpace and 40 million from adult dating website Fling.com.
According to Tumblr's security note on May 12, attackers obtained user email addresses with salted and hashed passwords in early 2013, before the company was acquired by Yahoo.
