The California Office of the Attorney General reported a data breach involving BMO Harris Bank N.A. on May 31, 2017. The breach occurred on May 15, 2017, when some customers received another customer's IRS Form 5498 due to an error, potentially exposing names, addresses, and the last four digits of Social Security Numbers. This incident highlights the importance of data accuracy and security in financial institutions, as even minor errors can lead to significant data exposure and potential identity theft risks for customers.
Source: https://oag.ca.gov/ecrime/databreach/reports/sb24-69411
TPRM report: https://www.rankiteo.com/company/bmo-commercial-bank
"id": "bmo532072625",
"linkid": "bmo-commercial-bank",
"type": "Breach",
"date": "5/2017",
"severity": "50",
"impact": "2",
"explanation": "Attack limited on finance or reputation"{'affected_entities': [{'industry': 'Financial Services',
'name': 'BMO Harris Bank N.A.',
'type': 'Bank'}],
'attack_vector': 'Error',
'data_breach': {'file_types_exposed': ['IRS Form 5498'],
'personally_identifiable_information': ['Names',
'Addresses',
'Last four digits of '
'Social Security '
'Numbers'],
'sensitivity_of_data': 'Medium',
'type_of_data_compromised': ['Names',
'Addresses',
'Last four digits of Social '
'Security Numbers']},
'date_detected': '2017-05-15',
'date_publicly_disclosed': '2017-05-31',
'description': 'The California Office of the Attorney General reported a data '
'breach involving BMO Harris Bank N.A. on May 31, 2017. The '
'breach occurred on May 15, 2017, when some customers received '
"another customer's IRS Form 5498 due to an error, potentially "
'exposing names, addresses, and the last four digits of Social '
'Security Numbers.',
'impact': {'data_compromised': ['Names',
'Addresses',
'Last four digits of Social Security '
'Numbers']},
'references': [{'date_accessed': '2017-05-31',
'source': 'California Office of the Attorney General'}],
'title': 'BMO Harris Bank N.A. Data Breach',
'type': 'Data Breach'}