Some of the largest, most damaging breaches of 2024 already account for over a billion stolen records. Plus, some special shout-outs.

We’re over halfway through 2024, and already this year we have seen some of the biggest, most damaging data breaches in recent history. And just when you think that some of these hacks can’t get any worse, they do. From huge stores of customers’ personal information getting scraped, stolen and posted online, to reams of medical data covering most people in the United States getting stolen, the worst data breaches of 2024 to date have already surpassed at least 1 billion stolen records and rising. These breaches not only affect the individuals whose data was irretrievably exposed, but also embolden the criminals who profit from their malicious cyberattacks. Travel with us to the not-so-distant past to look at how some of the biggest security incidents of 2024 went down, their impact and. in some cases, how they could have been stopped.

  • AT&T’s Data Breaches: AT&T experienced two data breaches in 2024, affecting nearly all its customers and many non-customers. The breaches exposed phone numbers, call records, and personal information, risking account hijacks for 7.6 million customers.

  • Change Healthcare Hack: A ransomware attack on Change Healthcare resulted in the theft of sensitive medical data, affecting a substantial proportion of Americans. The breach caused widespread outages in healthcare services across the U.S. and compromised personal, medical, and billing information.

  • Synnovis Ransomware Attack: The cyberattack on U.K. pathology lab Synnovis disrupted patient services in London hospitals for weeks, leading to thousands of postponed operations and the exposure of data related to 300 million patient interactions. Snowflake Data Theft (Including Ticketmaster): Cybercriminals stole hundreds of millions of records from Snowflake’s corporate customers, including 560 million records from Ticketmaster. The breach affected data from multiple companies and institutions, exposing vast amounts of customer and employee information.

  • Snowflake Data Theft: (Including Ticketmaster): Cybercriminals stole hundreds of millions of records from Snowflake’s corporate customers, including 560 million records from Ticketmaster. The breach affected data from multiple companies and institutions, exposing vast amounts of customer and employee information.