Yahoo confirms data breach of 500 million user accounts

Yahoo has suffered a data breach affecting 500 million user accounts, potentially making it the largest successful breach in history. The state-sponsored attack took place in 2014 and may have accessed names, email addresses, telephone numbers, dates of birth, hashed passwords, and security questions and answers. Yahoo is working with law enforcement and advising users to change passwords and review accounts for suspicious activity. The breach does not appear to have included payment card data, bank account information, or protected health information. Healthcare organizations should learn from these high-profile hacks and improve their own cybersecurity measures.