Breachesby GlyphChina Software Developer Network
Disclosed Dec 21, 20116,000,000 affectedUnverified
Leak exposes usernames and passwords of 6 million Chinese developer site users
User names, passwords and email addresses of more than 6 million users of the China Software Developer Network leaked online on December 21, 2011. Police arrested a suspect surnamed Zeng.
What is known
| People affected | 6,000,000 (as reported by the organization) |
|---|---|
| Disclosed | Dec 21, 2011 |
| Happened | Dec 21, 2011 |
| Attack | Hacking |
| Data exposed | EmailsPasswordsCredentials and tokens |
| Sector | Tech · CN |
| Status | Unverified: not yet confirmed by an official notice, a filing or the organization |
| Check your email | Have I Been Pwned |
Sources
Notices filed
History of this record
aggregator to pressby seedSource
https://haveibeenpwned.com/Breach/CSDN to https://web.archive.org/web/20120328065303/http://www.zdnet.com/blog/security/chinese-hacker-arrested-for-leaking-6-million-logins/11064by seedSource
empty to CNby seedSource
unknown to hackingby seedSource
["emails","passwords"] to ["emails","passwords","credentials"]by seedSource
hibp to organizationby seedSource
6414990 to 6000000by seedSource
2025-11-27 to 2011-12-21by seedSource
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. to User names, passwords and email addresses of more than 6 million users of the China Software Developer Network leaked online on December 21, 2011. Police arrested a suspect surnamed Zeng.by seedSource
empty to Leak exposes usernames and passwords of 6 million Chinese developer site usersby seedSource
First recordedby backfillSource
First seen 2026-09-25 (Have I Been Pwned). Record counts are as reported. Not legal advice.