2008 GS Caltex — large-volume South Korean customer dataset leak tied to mishandled physical media
Data compromised
Names, addresses, telephone numbers, and national ID-class fields per Korean press summaries
Technical writeup
English-language and Korean press widely reported a major GS Caltex customer personal-data incident in September 2008 involving roughly 11 million records, with coverage describing discovery on discarded optical media and extensive police investigation; specifics evolved across early articles and later litigation summaries. BreachHistory cites representative contemporaneous reporting and breach compilations (including Wikipedia’s data-breach list) for high-level indexing.
Root cause
Insider mishandling / physical loss of customer dataset media (per contemporaneous reporting and later legal summaries)