The California Office of the Attorney General reported a data breach involving Anthem Blue Cross on November 20, 2013. The breach occurred due to a PDF document posted on the Anthem website from October 23, 2013, until October 24, 2013, which erroneously displayed provider Tax Identification Numbers. The affected information included names, business addresses, and potentially Social Security Numbers, although it was stated that there was no reason to believe the Social Security Numbers had been compromised.
Source: https://oag.ca.gov/ecrime/databreach/reports/sb24-43327
TPRM report: https://www.rankiteo.com/company/anthembcbs
"id": "ant626072725",
"linkid": "anthembcbs",
"type": "Breach",
"date": "10/2013",
"severity": "50",
"impact": "2",
"explanation": "Attack limited on finance or reputation"
{'affected_entities': [{'industry': 'Healthcare',
'location': 'California',
'name': 'Anthem Blue Cross',
'type': 'Health Insurance Provider'}],
'attack_vector': 'Improper Data Handling',
'data_breach': {'file_types_exposed': ['PDF'],
'personally_identifiable_information': ['Names',
'Business Addresses',
'Potentially Social '
'Security Numbers'],
'sensitivity_of_data': 'High',
'type_of_data_compromised': ['Provider Tax Identification '
'Numbers',
'Names',
'Business Addresses',
'Potentially Social Security '
'Numbers']},
'date_detected': '2013-11-20',
'date_publicly_disclosed': '2013-11-20',
'description': 'A data breach involving Anthem Blue Cross occurred due to a '
'PDF document posted on the Anthem website that erroneously '
'displayed provider Tax Identification Numbers.',
'impact': {'data_compromised': ['Provider Tax Identification Numbers',
'Names',
'Business Addresses',
'Potentially Social Security Numbers']},
'references': [{'date_accessed': '2013-11-20',
'source': 'California Office of the Attorney General'}],
'title': 'Anthem Blue Cross Data Breach',
'type': 'Data Breach',
'vulnerability_exploited': 'Public Exposure of Sensitive Information'}