519K accounts from vBulletin (vbulletin.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 addressesHomepage URLsInstant messenger identitiesIP addressesPasswordsSecurity questions and answersSpoken languagesWebsite activity
In November 2015, the forum software maker vBulletin suffered a serious data breach. The attack lead to the release of both forum user and customer accounts totalling almost 519k records. The breach included email addresses, birth dates, security questions and answers for customers and salted hashes of passwords for both sources.
Source: Have I Been Pwned (CC BY 4.0)