Breachesby GlyphSK Communications
Disclosed Jul 28, 201135,000,000 affectedUnverified
Hackers steal personal data of 35 million Nate and Cyworld users
Attackers compromised the ALZip update server used by SK Communications, infected more than 60 company computers between July 18 and 25, 2011, then took personal data of up to 35 million Nate and Cyworld users. The company announced the hack on July 28, 2011, and a Seoul court later ordered damages to plaintiffs.
What is known
| People affected | 35,000,000 (as reported by the organization) |
|---|---|
| Disclosed | Jul 28, 2011 |
| Attack | Supply chain |
| Data exposed | NamesCredentials and tokensGovernment IDsOther |
| Sector | Tech · KR |
| Status | Unverified: not yet confirmed by an official notice, a filing or the organization |
| Lawsuit or fine | Seoul court ordered damages to 2,737 class action plaintiffs (2013) |
Sources
Notices filed
History of this record
First recordedby seedSource
First seen 2026-09-25 (Research). Record counts are as reported. Not legal advice.