48.6K accounts from Quantum Booter (quantumbooter.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 addressesPasswordsPrivate messagesUsernamesWebsite activity
In March 2014, the booter service Quantum Booter (also referred to as Quantum Stresser) suffered a breach which lead to the disclosure of their internal database. The leaked data included private discussions relating to malicious activity Quantum Booter users were performing against online adversaries, including the IP addresses of those using the service to mount DDoS attacks.
Source: Have I Been Pwned (CC BY 4.0)