777K accounts from Black Hat World (blackhatworld.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 addressesInstant messenger identitiesIP addressesPasswordsUsernamesWebsite activity
In June 2014, the search engine optimisation forum Black Hat World had three quarters of a million accounts breached from their system. The breach included various personally identifiable attributes which were publicly released in a MySQL database script.
Source: Have I Been Pwned (CC BY 4.0)