Commonwealth Bank
The Commonwealth Bank lost the personal financial histories of 12 million customers and chose not to reveal the breach to consumers.
It happened after a subcontractor lost several tape drives containing the financial information in 2016.
Personal banking statements contain potentially sensitive personal information and can paint a detailed portrait of the financial and personal affairs of a person which could potentially be misused by organized crime groups.
The information disclosed in the breach did not contain anything that could directly compromise accounts, such as passwords or PIN numbers.
The bank then undertook significant steps to attempt to retrieve the information.
"id": "COM234728722",
"linkid": "commonwealthbank",
"type": "Data Leak",
"date": "05/2018",
"severity": "60",
"impact": "4",
"explanation": "Attack with significant impact with customers data leaks"