Dixons Carphone has admitted a huge data breach involving 5.9 million payment cards and 1.2 million personal data records.
It has begun investigating the hacking attempt, which it said happened in the past year.
Dixons Carphone said it had no evidence that any of the cards had been used fraudulently following the breach.
It said 5.8 million of the credit and debit cards had chip-and-pin protection and that pin codes had not leaked.
As a result, about 105,000 non-EU cards, which were not chip-and-pin, had been compromised, it said.
The hackers had tried to gain access to one of the processing systems of Currys PC World and Dixons Travel stores, the firm said.
Dixons Carphone chief executive Alex Baldock said it was “extremely disappointed” by the data breach and “sorry for any upset”,
“The protection of our data has to be at the heart of our business, and we’ve fallen short here.
“We’ve taken action to close off this unauthorised access and though we have currently no evidence of fraud as a result of these incidents, we are taking this extremely seriously,” he added.
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