Operation Endgame 2.0 data breach: 15.4M accounts exposed
Severity: high · Patch status: no-fix-needed · Since 2025-05-23
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. Exposed data: email addresses, passwords. The breach dates from May 23, 2025; Have I Been Pwned loaded it on May 23, 2025.
What to do
- If you had a Operation Endgame 2.0 account, change its password and the password of any other account that reused it.
- Turn on multi-factor authentication wherever it is offered.
- Check whether your addresses are in this breach at https://haveibeenpwned.com.
- Expect targeted phishing that quotes the leaked details; verify any unexpected contact out of band.
Sources
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