Marks & Spencer has revealed customers’ personal data was taken by hackers after it was hit by a damaging cyber attack.
The retail giant’s chief executive Stuart Machin said the data had been accessed due to the “sophisticated nature of the incident”.
However he stressed this does not include “usable payment or card details, which we do not hold on our systems”.
There is also no evidence that account passwords have been shared, M&S said.
The company did not say how many customers had been affected but Mr Machin said there was “no need for customers to take any action”.
“To give customers extra peace of mind, they will be prompted to reset their password the next time they visit or log on to their M&S account and we have shared information on how to stay safe online,” he said.
M&S had 9.4 million active online customers in the year to 30 March, according to its last full-year results.
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Cybersecurity experts told Sky News that the lack of sensitive data being shared “does not mean that customers are not at risk”.
“With simple data such as names, email addresses, and potentially other personal details like addresses or phone numbers, which have been reported as accessed, attackers can use this information to create highly targeted and convincing phishing emails or text messages,” said Tim Grieveson, chief security officer at ThingsRecon.
“These emails from attackers can appear very legitimate because they use real personal information.”
Charlotte Wilson, Check Point’s head of enterprise, said: “Customers should not assume there is nothing to worry about.
“This type of data is protected for a reason. We often see a spike in phishing emails, fake delivery texts and scam calls after breaches like this, particularly when order history or usernames are involved.
“This is not about panic,” she said, “But it is a reminder that cybersecurity is not just about technology. It requires everyday awareness.
“Avoid unexpected links, treat unsolicited messages with caution, and turn on two-factor authentication wherever possible.”
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M&S has been struggling for weeks after hackers, reportedly from the Scattered Spider group, attacked their networks.
The British retailer was forced to halt recruitment amid the ongoing attack that became apparent on Easter Monday.
Shelves around the country have been bare and customers are unable to shop online.
Agency staff at some distribution centres were also told to stay at home because of the attack.
Last week, an M&S insider told Sky News it could be “months” before the retailer fully recovers – and that the company had no plan for such an incident.
An employee at M&S’s head office, who spoke to Sky News on condition of anonymity, said it had been “pure chaos” in the wake of the attack.
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“We didn’t have any business continuity plan [for this], we didn’t have a cyber attack plan,” the source said.
“In general, it’s lots of stress. People have not been sleeping, people have spent their weekends working, people sleeping in the office – just reactive response.”
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The Co-op also faced a similar major incident and was forced to apologise after hackers managed to access the data of a “significant number” of past and current members.
In the same week, luxury department store Harrods also suffered an attempted hack and temporarily restricted internet access across its sites as a precautionary measure.
The National Crime Agency has said it is investigating the attacks individually but it is “mindful they may be linked”.
