The Musgrave group, who own the three supermarket chains, says hackers tried to steal debit and credit card numbers and expiry dates but there is no evidence any data has so far been stolen.
The attempted cyber attack was discovered yesterday when malicious software was found in a centralised IT system but the Musgrave as it doesn’t keep cardholder names, PIN numbers or CCV numbers customers security was not compromised.
They do however advise customers to review activity on their statements as a precautionary measure and has apologised for the issue.
Gardaí and the Office of the Data Protection Commissioner have been notified of the attempted breach.
“While there is no evidence that any data has been stolen at this point, Musgrave is advising any concerned shoppers to review activity on their statements as a precautionary measure,” the company said in a statement.
Musgrave also said it has “cyber breach response experts” and they have installed advanced technical fixes to combat the attempted breach.
The company said it would continue to actively manage and monitor the situation.
“The protection of information is an absolute priority for Musgrave, with a range of security solutions including threat-monitoring, anti-virus software, firewall and penetration testing deployed,” Musgrave said.
“The company aims to ensure that security standards are maintained at the highest levels and apologises to its customers for this issue.”