Citigroup Inc. said its free U.S. mobile-banking application for Apple Inc.'s iPhone contained a security flaw and advised its customers to upgrade to a newer version that corrects the problem.
In an incident that highlights the growing security challenges around wireless apps, Citi said its iPhone app accidentally saved information—including account numbers, bill payments and security access codes—in a hidden file on users' iPhones. The information may also have been saved to a user's computer if it had been synched with an iPhone.
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