In mid-2012, Dropbox suffered a data breach which exposed the stored credentials of tens of millions of their customers. In August 2016, they forced password resets for customers they believed may be at risk. A large volume of data totalling over 68 million records was subsequently traded online and included email addresses and salted hashes of passwords (half of them SHA1, half of them bcrypt).
Accounts breached: 68648009
Breached on: July 01, 2012
Exposed data: Email addresses and Passwords
Added on: August 31, 2016