CSDN
csdn.net
About This Breach
CSDN, a Chinese software developer community platform, suffered a data breach in 2011 that exposed over 6M user records. The compromised data included email addresses alongside usernames and passwords stored in plain text.
Data Exposed
Breach Details
| Breach Type | Data Breach |
| Searchable | Yes |
| Verified | Yes |
| Sensitive Data | No |
| Reference | No reference available |
Frequently Asked Questions
When did the CSDN data breach happen?
CSDN was breached in Dec 2011. The breach was added to the XposedOrNot index on February 15, 2026.
How many records were exposed in the CSDN breach?
6,427,771 records were exposed, making it the #167 largest of the 763 breaches in our index.
What data was exposed in the CSDN breach?
The exposed data includes: Email addresses, Usernames, Passwords.
What should I do if I was affected by the CSDN breach?
Change your password on the affected service (and anywhere you reused it), turn on two-factor authentication, and set up free breach alerts on XposedOrNot so you know the moment your email appears in a new breach.
More Information Technology Breaches
What Should You Do?
Change Your Passwords
Update your password immediately, using 12+ characters with numbers and symbols.
Enable Two-Factor Authentication
Add 2FA on all supported accounts using an authenticator app like Google Authenticator or Authy.
Monitor Your Accounts
Set up login alerts and review account activity regularly for suspicious access.
Use a Password Manager
Never reuse passwords: use a password manager to generate unique ones for each account.