Citibank is re-issuing a number of MasterCard credit and debit cards used in the UK, Canada and Russia, after admitting customer accounts have become compromised after its network was breached.
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The bank said it had become aware of a “third-party business information breach”. It would not be more specific, but this could mean that a retailer or credit clearing house had lost customers’ data.
Citibank said that last month it had detected “several hundred fraudulent cash withdrawals in three countries”.
As a result, said the bank, it was re-issuing cards to those customers affected. It said it had already blocked PIN-based transactions on some of the cards that have been compromised, preventing any ATM withdrawals.
The Bank of America recently reported its second major data breach in a year. The largest US bank cancelled the debit cards of a number of its customers following a data security breach at an undisclosed company. It is not clear whether the breach affected an online company or a high street chain.
The bank did not disclose the number of customers affected, but it said many would have their cards cancelled and replaced as a precaution.