MADISON, Wis. — Despite Heartland Payment Systems attempt to play down the significance of a security breach in a recent announcement, it appears that hackers were able to compromise a significant number of card accounts, according to CUNA Mutual Group.

"Although the exact number of affected cards is not known, it is expected to be many millions. Card-issuing credit unions and their members will be impacted by this breach," said Chuck Cashman, an executive with CUNA Mutual's Plastic Card Insurance.

The insurer reported that Visa and MasterCard have confirmed a significant number of credit and debit card accounts were compromised in the 2008 breach, which the company announced on Jan. 20.

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