The security breach of 3 million Yahoo accounts is the largest hack in history, and has worsened further to triple the trouble for Yahoo. Every single person in its 3 billion accounts has been hacked in a 2013 breach. This information stems from an investigation after Verizon's takeover of Yahoo in June in a $4.48 billion deal. After an association, it’s confirmed that all Yahoo user accounts were affected during the August 2013 theft. After the network security incident at Equifax, this news of Yahoo account hack has come as another setback.