The data was being actively traded on underground forums and included email addresses, birth dates and passwords.
The unencrypted hints also disclosed much about the passwords adding further to the risk that hundreds of millions of Adobe customers already faced.
The data contained over 4 million unique email addresses along with IP addresses, usernames and passwords stored as unsalted MD5 hashes.
Breach date: 19 April 2016 Date added to HIBP: 8 July 2016 Compromised accounts: 4,009,640 Compromised data: Device information, Email addresses, IP addresses, Passwords, Usernames In late 2011, a series of data breaches in China affected up to 100 million users, including 7.5 million from the gaming site known as 17173.
In approximately March 2015, the free web hosting provider 000webhost suffered a major data breach that exposed almost 15 million customer records.
The data was sold and traded before 000webhost was alerted in October.
The breach included names, email addresses and plain text passwords.