Data breach
China Software Developer Networkcsdn.net
6 414 990 accounts exposed in a breach dated 2011-12-21.
Breached2011-12-21Added to HIBP2025-11-27 UTCUpdated by HIBP2025-11-27 UTCAccounts6 414 990Domaincsdn.net
Verified
What happened in Have I Been Pwned’s words
In 2011, the China Software Developer Network (CSDN) suffered a data breach that exposed over 6M user records. The data included email addresses alongside usernames and plain text passwords.
Exposed data as HIBP classifies it
- Email addresses
- Passwords
- Usernames
How HIBP qualifies it
- HIBP verified that the data came from this service.
Source: Have I Been Pwned (CC BY 4.0)
Copied from HIBP 2026-11-05 03:50 UTC