Securing the number one spot – almost seven years after the initial breach and four since the true number of records exposed was revealed – is the attack on Yahoo. So, here it is – an up-to-date list of the 15 biggest data breaches in recent history, including details of those affected, who was responsible, and how the companies responded (as of July 2021).
The latter have purposefully not been included in the list. We have also made a distinction between incidents where data was actively stolen or reposted maliciously and those where an organization has inadvertently left data unprotected and exposed, but there has been no significant evidence of misuse. How large cyberattacks of the future might become remains speculation, but as this list of the biggest data breaches of the 21 st Century indicates, they have already reached enormous magnitudes.įor transparency, this list has been calculated by the number of users impacted, records exposed, or accounts affected.
Digital transformation has increased the supply of data moving, and data breaches have scaled up with it as attackers exploit the data-dependencies of daily life. In today’s data-driven world, data breaches can affect hundreds of millions or even billions of people at a time.
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