Tesco has moved swiftly to reassure customers that there is “no reason” to believe any of their personal data has been compromised following the suspected hack attack on its website at the weekend, that left thousands of shoppers unable to buy groceries or track their orders online.
The issue began on Saturday morning and continued into Sunday, with the supermarket giant claiming the problem was because of an attempt to “interfere” with its systems. It left customers unable to make changes to pre-arranged orders and prompted a flood of queries to Tesco.
A spokesperson said on Sunday night: “Our online grocery website and app are now back up and running. Our teams have worked around the clock to restore service, and we’re really sorry to our customers for the inconvenience caused.”
Customers were told they might need to enter a virtual waiting room before accessing the site as Tesco tries to manage the initial flow of traffic.
The firm’s online sales have soared recently, especially during lockdown, with the supermarket ramping up capacity. Its most recent H1 update showed that online sales have rocketed 74.1% compared to the pre-Covid figures of two years ago.
Overall, total online sales topped £6bn; it now has 6.6 million registered app users.
This is not the first security incident which Tesco has incurred. In March last year, the supermarket blocked 620,000 Clubcard accounts after discovering a credential stuffing attack on its platform. The firm said it noticed fraudulent activity where scammers were using its website to test a database of usernames and passwords.
The database was likely stolen from another platform, but it might have worked in cases where customers used the same username and password, Tesco warned.
Meanwhile, in 2014 about 2,000 customer accounts were deactivated amid fears login details were compromised, and there was also a cyber attack on Tesco Bank.
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