707K accounts from Programming Forums (programmingforums.org) 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 late 2015, the programming forum at programmingforums.org suffered a data breach resulting in the exposure of 707k unique user records. The data contained email and IP addresses, usernames and salted MD5 hashes of passwords. The site was previously reported as compromised on the Vigilante.pw breached database directory.
Source: Have I Been Pwned (CC BY 4.0)