The dating site for people wanting to cheat on their spouses was breached last month.
The 10GB file contains email addresses, names, credit cards, and other potentially compromising information. Ashley Madison sold customers a service that purported to erase all their transactions within the service's records, but the person(s) who breached the site claimed this was a lie and that the allegedly deleted material was all present and ready to be leaked.
As yet, the file has not been authenticated or conclusively identified as a fake.
Data from hack of Ashley Madison cheater site purportedly dumped online [Dan Goodin/Ars Technica]