739K accounts from WildStar (wildstar-online.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Dates of birthEmail addressesIP addressesPasswordsUsernames
In July 2015, the IP.Board forum for the gaming website WildStar suffered a data breach that exposed over 738k forum members' accounts. The data was being actively traded on underground forums and included email addresses, birth dates and passwords.
Source: Have I Been Pwned (CC BY 4.0)