UK: Tesco Bank debit cards risked cyber crime, warn rivals
12 Dec 2016

Tesco Bank left its customers exposed to cyber crime by issuing sequential debit card numbers, a practice most banks avoid because it lets hackers remain undetected while working quickly through thousands of accounts, according to rival lenders.

A sustained cyber attack on Tesco Bank last month forced the company to repay £2.5m of losses to 9,000 customers in a heist described as unprecedented by regulators.

Since then the Financial Conduct Authority has contacted several British lenders to check if they are also issuing sequential card numbers, according to executives at two of the banks contacted by the watchdog.

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