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A cybersecurity firm said on Tuesday that it uncovered stolen credentials from some 360 million accounts that are available for sale on cyber black markets, though it is unsure where they came from or what they can be used to access.
The discovery could represent more of a risk to consumers and companies than stolen credit card data because of the chance the sets of user names and passwords could open the door to online bank accounts, corporate networks, health records and virtually any other type of computer system.
Alex Holden, chief information security officer of Hold Security LLC, said in an interview that his firm obtained the data over the past three weeks, meaning an unprecedented amount of stolen credentials is available for sale underground.
"The sheer volume is overwhelming," said Holden, whose firm last year helped uncover a major data breach at Adobe Systems Inc. in which tens of millions of records were stolen.
Holden said he believes the 360 million records were obtained in separate attacks, including one that yielded some 105 million records, which would make it the largest single credential breaches known to date.
He said he believes the credentials were stolen in breaches that have yet to be publicly reported. The companies attacked may remain unaware until they are notified by third parties who find evidence of the hacking, he said.
(Read more: Target warns breach costs could hurt future profit)
He has not provided any information about the attacks to other cybersecurity firms or authorities but intends to alert the companies involved if his staff can identify them.
The massive trove of credentials includes user names, which are typically email addresses, and passwords that in most cases are in unencrypted text. Holden said that in contrast, the Adobe breach, which he uncovered in October 2013, yielded tens of millions of records that had encrypted passwords, which made it more difficult for hackers to use them.
(Read more: House panel demands documentation on Target breach)
The stolen data is not believed to be related to a major payment-card data breach late last year at U.S. retailer Target.
—By NBC News With Reuters