16.5M accounts from Operation Endgame were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesPasswords
In May 2024, a coalition of international law enforcement agencies took down a series of botnets in a campaign they coined "Operation Endgame". Data seized in the operation included impacted email addresses and passwords which were provided to HIBP to help victims learn of their exposure.
Source: Have I Been Pwned (CC BY 4.0)