Equifax, a provider of consumer credit scores, said Thursday a hack exposed the personal details of potentially 143 million U.S. consumers between mid-May and July.
The company said criminals had accessed details including names, Social Security numbers and, in some cases, driver’s license numbers.
In addition, credit card numbers of around 209,000 consumers and certain dispute documents with personal identifying information of around 182,000 consumers were accessed, the company said.
Atlanta-based Equifax also said personal information of certain United Kingdom and Canadian residents were hacked.
Equifax, which discovered the unauthorized access on July 29, said it had hired a cybersecurity firm to investigate the breach.
The company said there was no evidence of a breach into its core consumer or commercial credit reporting databases.
The breach could be one of the biggest in the United States.
Last December, Yahoo said more than one billion user accounts were compromised in August 2013, while in 2014 e-commerce company eBay had urged 145 million users to change their passwords following a cyber attack.