Tesco Bank went into lockdown as customers complained hundreds of pounds had been taken from their accounts.
Tesco has more than seven million customer accounts and 4,000 staff based in Edinburgh, Glasgow and Newcastle.
The bank said its anti-fraud systems had identified "suspicious activity" on a number of customer accounts".
It said some cards were immediately blocked as a precautionary measure.
Those cardholders would still be able to use online banking, the company said.
Tesco Bank said the customers affected numbered "in the thousands but less than 10,000" and that they had all been sent alerts to notify them. It said they should contact the bank if they had any concerns.
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