Yahoo is a little bit like Equifax in early days, 3 Billion accounts leaked

By any measure, the new 3 billion breach figure is staggering, says Troy Hunt, an Australian information security expert who runs the Have I Been Pwned data breach notification site.

Yahoo says its entire user base of 3 billion accounts was compromised by an August 2013 data breach.

"Yahoo is a little bit like Equifax," Hunt says, referring to the intrusion at the credit bureau that exposed 145.5 million personal records, including credit card data and Social Security numbers, for a majority of U.S. adults. "Every time you go, 'Nah, this is it, we've hit rock bottom,' it just keeps getting worse."

Yahoo warned that it had suffered a 2014 security breach that compromised only 500 million users' accounts initially.

See my post on Equif#$#x TimeLine

From https://www.govinfosecurity.com/yahoo-3-billion-accounts-breached-in-2013-a-10355