Monzo have called for customers to change their pins immediately after their information was exposed to unauthorised staff.
The digital bank have been forced to apologise after almost one in five of their clients were affected by the security breach. (That's around 480,000 UK accounts).
Speaking in a statement, the company revealed that they have now resolved the issue.
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They said: "We've fixed an issue that meant we weren't storing some customers' pins correctly.
"On Friday August 2, we discovered that we'd also been recording some people's pins in a different part of our internal systems (in encrypted log files).
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"Engineers at Monzo have access to these log files as part of their job."
The bank assured users that it had now deleted this wrongly stored information.
"As soon as we discovered the bug, we immediately made changes to make sure the information wasn't accessible to anyone in Monzo," they said.
"By 5:25am on Saturday morning, we had released updates to the Monzo apps.
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"Over the weekend, we then worked to delete the information that we'd stored incorrectly, which we finished on Monday morning."
Monzo also confirmed that they had checked all accounts affected to confirm nobody's information had been used to commit fraud.
"If we've contacted you to tell you that you've been affected, you should head to a cash machine to change your pin to a new number as a precaution," they went on
However, fear not Monzo users - as the bank added that if you haven't been emailed then you haven't been affected.
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Even so, they're telling people to update their apps, and contact them should they notice any unusual activity.
The drama occurred only one week after the digital bank experienced a temporary outage which meant some people's card purchases weren't going through.
The brand, which launched in 2015, is popular for its digital first approach, and of course, its coral pink cards.
Featured Image Credit: Credit: Instagram/MonzoTopics: Life News