2013 — Comcast: The California Public Utilities Commission launched…
Data compromised
Personal information
Technical writeup
The California Public Utilities Commission launched an investigation into the unauthorized disclosure and publication of Comcast subscribers' unlisted names, telephone numbers and addresses to determine whether Comcast violated the laws, rules, and regulations of California.UPDATE (8/25/2014): An evidentiary hearing has been scheduled in this case for September 2014 to investigate whether or not Comcast broke the law.
Root cause
Unknown