ShellCodeX Breach Report
China Software Developer Network Data Breach
csdn.net
Verified breach
Passwords exposed
Accounts exposed
6,414,990
Breach date
21 Dec 2011
Added to tracker
27 Nov 2025
Data classes
3
What happened
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
Email addresses
Passwords
Usernames
Recommended actions
- Change your China Software Developer Network password immediately, and update it anywhere you reused the same password.
- Enable two-factor authentication on the affected account and on your critical services (email, banking).
- Watch for targeted phishing emails referencing China Software Developer Network — attackers weaponise breach data quickly.
- Check whether your email address appears in this breach on haveibeenpwned.com.
Am I affected?
Check whether your email address appears in this breach.
Check on HIBP
