45K accounts from Lounge Board (loungeboard.net) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesIP addressesNamesPasswordsPrivate messagesUsernamesWebsite activity
At some point in 2013, 45k accounts were breached from the Lounge Board "General Discussion Forum" and then dumped publicly. Lounge Board was a MyBB forum launched in 2012 and discontinued in mid 2013 (the last activity in the logs was from August 2013).
Source: Have I Been Pwned (CC BY 4.0)