2013 Breach Appears Separate from Another Breach Involving 500 Million Users
Yahoo has the dubious distinction of having not just one but two record-shattering historical breaches come to light this year. The latest breach to be revealed, which dates back to 2013, involved the potential compromise of 1 billion accounts.
Source: inforisktoday.com – Ciber Security
Yahoo Breach Alert: 1 Billion Accounts at Risk