Lloyds Bank, Halifax and Bank of Scotland customers have voiced shock and concern after being able to see some other users’ transactions on their banking apps.
The glitch meant they were able to view charges and payments made by other people.
One Halifax customer has told the BBC she saw “loads of transactions” she did not recognise in her app – which together totalled more than £1m.
Lloyds Banking Group, which owns all three banks, has apologised for the issue – saying it had been resolved and will be investigated.