Posted by HardOCP News 5:30 PM (CDT)
Thursday May 12, 2016
I'm not sure how you can "thoroughly investigate" something like this when you didn't even know about it until now. Making matters worse, the passwords were from early 2013. Anyhow, if you are one of the affected users you will need to reset your password.
We recently learned that a third party had obtained access to a set of Tumblr user email addresses with salted and hashed passwords from early 2013, prior to the acquisition of Tumblr by Yahoo. As soon as we became aware of this, our security team thoroughly investigated the matter. Our analysis gives us no reason to believe that this information was used to access Tumblr accounts. As a precaution, however, we will be requiring affected Tumblr users to set a new password.