The Yahoo breach of 2013-2014 remains the largest in history, compromising all 3 billion user accounts. Data stolen included names, emails, phone numbers, birth dates, hashed passwords, and security questions, with the breach directly contributing to a $350 million reduction in Verizon's acquisition price. This financial impact per compromised account is far more costly than the #5 LinkedIn breach of 2021, highlighting the severe economic consequences of failing to secure user credentials across multiple years.
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