880K accounts from OwnedCore (OwnedCore.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 approximately August 2013, the World of Warcraft exploits forum known as OwnedCore was hacked and more than 880k accounts were exposed. The vBulletin forum included IP addresses and passwords stored as salted hashes using a weak implementation enabling many to be rapidly cracked.
Source: Have I Been Pwned (CC BY 4.0)