Lloyds discloses 80,508 joint accounts exposed in IT glitch

Lloyds Banking Group disclosed on Tuesday that an additional 80,508 joint account holders may have had their financial details exposed during an IT glitch that affected nearly 447,000 customers of Lloyds Bank, Halifax and Bank of Scotland on March 12.

The incident, caused by a software defect following an overnight IT update, led some customers who logged into the mobile banking app to view others' transactions or have their own data shared. Lloyds revised the initial figure slightly downward to 446,915 affected customers, citing data duplication, and confirmed that 107,937 of them accessed other users' transactions, down from an earlier estimate of 114,182. Exposed information potentially included account details, national insurance numbers and payment references. Personal data of non-Lloyds customers was also visible, though the bank reported no complaints from those individuals.

In a follow-up letter to the Treasury Committee, Lloyds stated that the joint account holders did not access the app during the glitch but had their transaction details potentially viewed by others. The bank notified most of them via an alert on the app home screen. "In notifying these customers, our...