A group of Saudi hackers calling themselves group-xp published details of more than 6,000 Israeli credit cards online in the second such incident in three days, army radio reported on Friday.
Details of the latest incident were revealed on Thursday in a Internet posting by a hacker who goes by the name "0xOmar" from group-xp who said he had posted details of 11,000 cards online.
But, Israel's three major credit card companies said the number of cards affected was only 6,050, the radio reported.
Earlier this week, 0xOmar posted a message on an Israeli sports website saying group-xp, which he described as the "greatest Saudi Arabian hacker team" had posted details of 400,000 Israeli cards online.
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After examining the details, Israel's major credit card companies said only 14,000 valid cards had been exposed.
"I have added another 11,000 credit cards which contains IsraCards and DinnerDash cards," 0xOmar wrote in his posting.
"This database contains 60,000 credit cards which also has MasterCard and Visa cards, but I'll send them later among with a lot of others," he said, claiming to have also hacked data from Israeli military contractor firms.
Yoram HaCohen, a senior official from the justice ministry told the radio he was "not so worried about the credit cards themselves" which could be cancelled, but about "the personal information which has been exposed, such as email addresses, passwords and ID card numbers."
He admitted it would be "difficult to track down the hackers behind these attacks because they take good precautions" and said Israel may turn to Interpol over the issue.