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Tesco Bank issued debit cards vulnerable to attack

Tesco Bank left its users vulnerable to hackers by issuing cards with sequential numbers, according to The Financial Times. Comments, from rival lenders, come after the bank suffered a damaging cyberattack that saw $2.5 million stolen from around 9,000 customers.

Issuing cards with sequential numbers is a risk that most banks avoid taking, as it increases the chances that a hacker will be able to quickly use a software tool access the accounts. And decreases the chance of fraud detection. Tesco has refused to confirm or deny the allegations.

“As this remains an ongoing investigation, we will not comment on specific questions regarding the incident,” Tesco Bank tells the FT. “However, we will confirm that our first priority was, and remains, to ensure that our customers’ accounts are safe and secure, and that we communicate with our customers immediately and transparently.”

The National Cyber Security Centre, the National Crime Agency and the Financial Conduct Authority are looking into the hack. It was revealed last month that Tesco may have ignored warnings about flaws in its systems from Visa.

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