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 A statement released by Visa said yesterday about 3,100 Chinese Visa cardholders are at risk, while MasterCard announced that up to 5,560 of its cardholders in China could be affected by the security breach at CardSystems in Tucson, Arizona.
The security breach, in which hackers had access to 40 million credit card accounts, was first reported last Friday by MasterCard in the United States.
About 22 million were Visa accounts, 13.9 million MasterCard, and the rest were American Express and Discover accounts. The head of CardSystems has acknowledged his firm should not even have been keeping the consumer records in the first place.
Both Visa and MasterCard have pledged to limit the risk to cardholders as much as possible. The companies said they have not yet identified any definite instances of fraudulent transactions relating to Chinese mainland cardholders.
American Express also said it was not aware of any fraudulent activity related to the incident, but did not give the number of mainland cardholders affected.
Chinese cardholders who may be vulnerable to potential risks are those who used credit cards in the United States between August 1, 2004 and May 27, 2005, according to the Peony Card Centre of Industrial and Commercial Bank of China (ICBC), the nation's largest lender.
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