SEIU Local 1 Data Breach Exposes Sensitive Worker Information
SEIU Local 1, a branch of the Service Employees International Union representing property service workers across six states, confirmed a data breach after detecting unauthorized access to an employee email account. The incident, discovered on March 27, 2025, involved suspicious activity traced back to two separate intrusions on March 4 and March 27, 2025.
An investigation revealed that exposed data may include names, dates of birth, Social Security numbers, and financial information. SEIU Local 1, headquartered in Chicago, has stated that affected individuals will be notified by mail once the review is complete and contact details are verified.
The breach impacts workers in 11 cities, primarily janitors, security guards, and food service employees. While the organization has secured its systems, the full scope of the exposure remains under review. Law firm Shamis & Gentile P.A. is investigating potential compensation for those affected.
SEIU Local 1 cybersecurity rating report: https://www.rankiteo.com/company/seiu-local-1
"id": "SEI1770198938",
"linkid": "seiu-local-1",
"type": "Breach",
"date": "3/2025",
"severity": "85",
"impact": "3",
"explanation": "Attack with significant impact with internal employee data leaks"{'affected_entities': [{'customers_affected': 'Workers in 11 cities (janitors, '
'security guards, food service '
'employees)',
'industry': 'Labor Organization',
'location': 'Chicago, Illinois, USA',
'name': 'SEIU Local 1',
'type': 'Labor Union'}],
'attack_vector': 'Unauthorized access to employee email account',
'customer_advisories': 'Affected individuals will be notified by mail once '
'the review is complete and contact details are '
'verified',
'data_breach': {'personally_identifiable_information': ['Names',
'Dates of birth',
'Social Security '
'numbers'],
'sensitivity_of_data': 'High',
'type_of_data_compromised': ['Personally Identifiable '
'Information',
'Financial Information']},
'date_detected': '2025-03-27',
'description': 'SEIU Local 1, a branch of the Service Employees International '
'Union representing property service workers across six '
'states, confirmed a data breach after detecting unauthorized '
'access to an employee email account. The incident involved '
'suspicious activity traced back to two separate intrusions on '
'March 4 and March 27, 2025. Exposed data may include names, '
'dates of birth, Social Security numbers, and financial '
'information.',
'impact': {'data_compromised': 'Names, dates of birth, Social Security '
'numbers, financial information',
'identity_theft_risk': 'High',
'payment_information_risk': 'High',
'systems_affected': 'Employee email account'},
'initial_access_broker': {'entry_point': 'Employee email account'},
'investigation_status': 'Under review',
'references': [{'source': 'Cyber Incident Description'}],
'response': {'communication_strategy': 'Affected individuals will be notified '
'by mail',
'containment_measures': 'Systems secured',
'third_party_assistance': 'Shamis & Gentile P.A. (law firm '
'investigating potential '
'compensation)'},
'title': 'SEIU Local 1 Data Breach Exposes Sensitive Worker Information',
'type': 'Data Breach'}