13.5K accounts from Lizard Squad (lizardstresser.su) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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In January 2015, the hacker collective known as "Lizard Squad" created a DDoS service by the name of "Lizard Stresser" which could be procured to mount attacks against online targets. Shortly thereafter, the service suffered a data breach which resulted in the public disclosure of over 13k user accounts including passwords stored in plain text.
Source: Have I Been Pwned (CC BY 4.0)