The company said Monday the largest category of jeopardized data was information on consumers and small businesses as of the time they applied for credit card products from 2005 through early 2019.
The data included personal information the company said it collects at the time it receives card applications, including names, addresses, ZIP codes, phone numbers, email addresses, dates of birth and self-reported income.
Beyond that application data, it said, the hacker also gained access to credit card data including credit scores, limits, balances and payment history as well as fragments of transactions data from a total of 23 days during 2016, 2017 and 2018.
About 140,000 Social Security numbers and 80,000 linked bank account numbers were compromised, according to Capital One.
The FBI arrested Paige Thompson of Seattle, who was charged with computer fraud and abuse, according to court records.
Here are the guidelines to determine if your information had been accessed as well as instructions on how to shore up account security.
For more information and updates on how to tell if you've been affected, customers can visit the Capital One website established for this breach, https://www.capitalone.com/facts2019.