3. FlexBooker
Number of individuals impacted: 3.75 million

In January, FlexBooker, which sells online appointment booking tools that businesses embed in their websites, revealed it had discovered a data breach that ultimately impacted more than three million people.

According to ZDNet, the Columbus, Ohio-based company said that some of its customer database had been breached after its AWS servers were compromised in late 2021 and that FlexBooker said its “system data storage was also accessed and downloaded” as part of the attack. The information obtained included partial credit card data, ZDNet reports.