Everyone remembers the Yahoo breach — it was simply historical and created mass hysteria at the time. The company ultimately confirmed in late 2017 that, following an alleged state-sponsored attack, all user accounts had been breached – that is 3 billion users. If you can’t really put your finger on what that number means, 3 billion was the world population in 1959.
Quite late in the incident, Yahoo came out in the media to disclose it had suffered three massive data breaches, raising serious questions about the company’s cybersecurity strategy, network security and business ethics. When it finally made it clear that its entire user base had been compromised, a number of class action lawsuits were initiated, as well as an investigation by the US Securities and Exchange Commission.
