429K accounts from Underworld Empire (underworldempireforums.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesIP addressesPasswordsUsernames
In April 2017, the vBulletin forum for the Underworld Empire game suffered a data breach that exposed 429k accounts. The data was then posted to a hacking forum in mid-February 2018 where it was made available to download. The source data contained IP and email addresses, usernames and salted MD5 hashes.
Source: Have I Been Pwned (CC BY 4.0)