U.K. digital bank Monzo Bank Ltd. is asking some 480,000 customers to change their personal identification numbers after it left them exposed to unauthorized staff for six months.

The potential breach was caused by what the bank described as a bug that exposed the PINs in log files that could be seen by engineers working for the company. The issue causing the PIN exposure was detected on Friday and rectified by Saturday morning and any incorrectly stored PINs deleted by Monday morning.

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