453K accounts from Yahoo (yahoo.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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In July 2012, Yahoo! had their online publishing service "Voices" compromised via a SQL injection attack. The breach resulted in the disclosure of nearly half a million usernames and passwords stored in plain text. The breach showed that of the compromised accounts, a staggering 59% of people who also had accounts in the Sony breach reused their passwords across both services.
Source: Have I Been Pwned (CC BY 4.0)