15.4M accounts from Operation Endgame 2.0 were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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In May 2025, a coalition of law enforcement agencies took down the criminal infrastructure behind the malware used to launch ransomware attacks in a new phase of "Operation Endgame". This followed the first Operation Endgame exercise a year earlier, with the latest action resulting in 15.3M victim email addresses being provided to HIBP by law enforcement. A further 43.8M victim passwords were also provided for HIBP's Pwned Passwords service.
Source: Have I Been Pwned (CC BY 4.0)