Monzo leaves almost half a million customers pins readable

Monzo has advised almost half a million customers to change their cards pin number after uncovering a potential security flaw. The digital bank said it had incorrectly stored around 480,000 customer pins where they could be accessed by internal engineers.

Monzo said it had checked all of the accounts affected by the error and “confirmed the information hasn’t been used to commit fraud”.

The bank referred the mishandling of customer data to the Information Commissioner’s Office, the UK data regulator, after discovering the problem last Friday.

The ICO said:

“We are aware of an incident involving Monzo and we will be assessing the matter.”

In a statement to customers, Monzo said that it stored pins in a secure part of its system. But it said it had discovered it had also been storing them in a different place, in files that were encrypted but could be decrypted and accessed by its engineers.

“We’ve deleted the information we stored in this way,” the company said.

“As soon as we discovered the bug, we immediately made changes to make sure the information wasn’t accessible to anyone in Monzo.”

The company advised anyone affected to update their phone app and change their pin by visiting a cash machine, adding:

“We’re really sorry about this.”

“If you think you see anything unusual on your account, please get in touch with us straight away through in-app chat or by ringing the phone number on your debit card.”

The Financial Conduct Authority said it was “aware of the issue” but declined to comment further.

 

Rapid Mobile

Rapid Mobile uses cookies, tokens, and other third party scripts to recognise visitors of our sites and services, remember your settings and privacy choices, and - depending on your settings and privacy choices - enable us and some key partners to collect information about you so that we can improve our services and deliver relevant ads.

 

By continuing to use our site or clicking I Accept, you agree that Rapid Mobile and our key partners may collect data and use cookies for personalised ads and other purposes, as described more fully in our privacy policy.

 

You can change your settings at any time by clicking Manage Settings or by visiting our Privacy Centre for more detailed information.

 

Privacy Settings saved!
Cookie Services

When you visit any website, it may store or retrieve information on your browser, mostly in the form of cookies. Because we respect your right to privacy, you can choose not to allow some types of cookies. Click on the different category headings to find out more and change our default settings. However, blocking some types of cookies may impact your experience of the site and the services we are able to offer.

These cookies allow us to count visits and traffic sources, so we can measure and improve the performance of our site.

We track anonymized user information to improve our website.
  • _ga
  • _gid
  • _gat

Decline all Services
Accept all Services