The personal details of about 106 million individuals across the US and Canada were stolen in a hack targeting Capital One systems.
BBC reports the announcement came after the alleged hacker was arrested.
According to Capital One, the data included names, addresses and phone numbers of people who applied for its credit card products.
But the hacker did not gain access to credit card account numbers.
Capital One said in a statement that the breach affected approximately 100 million in the US and 6 million in Canada.
The statement added that about 140,000 social security numbers and 80,000 linked bank account numbers were compromised in the US.
In Canada, about one million social insurance numbers belonging to Capital One credit card customers were also compromised.
Capital One said the hacker was able to "exploit" a "configuration vulnerability" in the company's infrastructure.
Aside from names and dates of birth, the hacker also managed to obtain credit scores, limits, balances, payment history and contact information.
[Source:BBC]
