Large-Scale Data Breaches Affect Millions of Users

After hackers had stolen user data from the popular dating website Asley Madison in July, the criminals now published 9.7 gigabytes of that data on what is known as the dark web. According to Wired, who were first to report the incident, the files included account details of roughly 32 million users, making the attack one of the larger data breaches in recent history.

Over the past few years, as consumers started sharing information with more and more websites, large-scale data breaches have become a worryingly common occurrence. Just last year, eBay had to ask 145 million users to change their passwords, after the company's database had been successfully attacked by hackers.

In the case of Ashley Madison, the potential damage to the affected users could be particularly spicy. After all, the dating platform considers itself "the most famous name in infidelity" and specializes in extramarital affairs.

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This chart shows how many data records have been compromised in some of the most prominent examples of data theft in recent years.

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Most significant incidents of data breach worldwide in 2023, by number of breached accounts (in millions)
Most significant data breaches in the United States as of December 2025, by impact
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Most significant cases of data breach worldwide as of December 2025, by number of compromised data records and individuals impacted
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Number of data points leaked in data breaches in the United States from 2004 to July 2026, by type of data (in millions)
Most significant data breaches in the United Kingdom (UK) as of January 2025, by impact
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Largest data breach incidents disclosed worldwide in 2024

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