In May 2013, the Russian-language hacking forum YouHack suffered a data breach that was later redistributed as part of a larger corpus of data. The breach exposed 107k forum members’ email addresses, usernames, IP addresses and MD5 password hashes, most of which were unsalted. Forum posts also contained email address and password pairs belonging to other victims, bringing the total to 7.2M unique email addresses.
- Breach date: 2013-05-29
- Added to HIBP: 2026-11-11 07:29 UTC
- Compromised accounts: 7,160,849
- Compromised data: Email addresses, IP addresses, Passwords, Usernames
- Domain: youhack.ru
- Verified: Yes
Source: Have I Been Pwned — Breaches · 2026-11-11