The Co-op has apologised after hackers managed to entry the info of a “significant number” of previous and present members.
The agency mentioned the compromised information included names and phone particulars however not passwords or financial institution and bank card particulars.
It mentioned it was “continuing to experience sustained malicious attempts”.
The Nationwide Cyber Safety Centre (NCSC) and the Nationwide Crime Company (NCA) are serving to the corporate examine.
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A spokesperson described it as a “highly complex situation” and mentioned it had “implemented measures to ensure that we prevent unauthorised access to our systems”.
“As a result of ongoing forensic investigations, we now know that the hackers were able to access and extract data from one of our systems,” mentioned an announcement.
“The accessed data included information relating to a significant number of our current and past members.”
It mentioned the info compromised additionally didn’t embody data on buyer transactions or services somebody might have with Co-op Group.
“We appreciate that our members have placed their trust in our Co-op when providing information to us,” mentioned the spokesperson.
“Protecting the security of our members’ and customers’ data is a priority, and we are very sorry that this situation has arisen.”
Co-op membership is an opt-in scheme that gives reductions and different advantages.
It comes as M&S and luxurious retailer Harrods have been additionally struck by cyber assaults this week.
On Monday, lots of of M&S company staff at its essential distribution centre have been advised to remain at residence because it grappled with the assault.
Consumers additionally complained of empty cabinets as M&S confirmed “pockets of limited availability in some stores” as a consequence of measures to handle the incident.
The corporate has additionally paused recruitment and briefly taken down its on-line recruitment pages.