Data breach
Synthient Stealer Log Threat Data data breach
182,962,095 accounts · breached April 11, 2025
This data comes from info-stealer malware logs: passwords captured on infected computers. If your address is in it, a device you used was infected at some point. Scan your devices and change the passwords you typed on them.
What happened
During 2025, Synthient aggregated billions of records of "threat data" from various internet sources. The data contained 183M unique email addresses alongside the websites they were entered into and the passwords used. After normalising and deduplicating the data, 183 million unique email addresses remained, each linked to the website where the credentials were captured, and the password used. This dataset is now searchable in HIBP by email address, password, domain, and the site on which the credentials were entered.
What data leaked
- Email addresses
- Passwords
What to do if you had an account
- Change the password. Change your password on this service. If you used the same password anywhere else, change it there too: attackers try leaked email and password pairs on other sites automatically. A password manager makes one unique password per site practical.
- Turn on two-step sign-in. Enable two-factor authentication where the service offers it, preferably with an authenticator app or a passkey. A leaked password alone is then not enough to get in.
- Expect targeted phishing. Leaked contact details are used to write convincing fake messages that mention the breached company or your real name. Do not click links in unexpected emails or texts about this account; go to the site by typing its address.
Check your email at haveibeenpwned.com
We do not run email lookups ourselves. The search is done on haveibeenpwned.com, the service this list comes from.