CSEA Local 1000 Data Breach Exposes Sensitive Information of Over 47,000 Individuals
Shamis & Gentile P.A., a class action law firm specializing in data breach cases, is investigating a cybersecurity incident involving the Civil Service Employees Association, Inc., Local 1000, AFSCME, AFL-CIO (CSEA Local 1000), New York’s largest labor union. The breach, discovered on May 30, 2025, exposed the personally identifiable information (PII) of 47,352 individuals nationwide.
CSEA Local 1000 represents over 250,000 members, including state and local government employees, firefighters, school staff, and retirees across six regional branches. The union is affiliated with AFSCME and the AFL-CIO, making it the largest AFSCME constituent in New York.
Timeline and Response
After detecting suspicious activity on its systems, CSEA Local 1000 launched an investigation, took affected systems offline, and engaged cybersecurity experts. The probe revealed that an unauthorized party accessed its systems between May 3 and May 31, 2025, compromising files containing sensitive data. Affected individuals began receiving written notifications in January 2026.
Exposed Information
The breach exposed the following data:
- Full names
- Social Security numbers
CSEA Local 1000 reported the incident to relevant government agencies and provided resources to help impacted individuals mitigate risks.
Legal Action Underway
Shamis & Gentile P.A. is evaluating potential claims on behalf of those affected, with compensation eligibility under review for victims of the breach.
Source: https://www.claimdepot.com/investigations/civil-service-employees-association-data-breach-2026
SEIU Local 1000 cybersecurity rating report: https://www.rankiteo.com/company/seiu-local-1000
"id": "SEI1769024138",
"linkid": "seiu-local-1000",
"type": "Breach",
"date": "5/2025",
"severity": "85",
"impact": "4",
"explanation": "Attack with significant impact with customers data leaks"{'affected_entities': [{'customers_affected': '47,352 individuals',
'industry': 'Public Sector / Labor Representation',
'location': 'New York, USA',
'name': 'Civil Service Employees Association, Inc., '
'Local 1000, AFSCME, AFL-CIO (CSEA Local 1000)',
'size': '250,000 members',
'type': 'Labor Union'}],
'customer_advisories': 'Written notifications sent to affected individuals',
'data_breach': {'number_of_records_exposed': '47,352',
'personally_identifiable_information': 'Full names, Social '
'Security numbers',
'sensitivity_of_data': 'High (Social Security numbers, full '
'names)',
'type_of_data_compromised': 'Personally identifiable '
'information (PII)'},
'date_detected': '2025-05-30',
'date_publicly_disclosed': '2026-01',
'description': 'A cybersecurity incident involving the Civil Service '
'Employees Association, Inc., Local 1000, AFSCME, AFL-CIO '
'(CSEA Local 1000) exposed the personally identifiable '
'information (PII) of 47,352 individuals nationwide. The '
'breach was discovered on May 30, 2025, and involved '
'unauthorized access to systems containing sensitive data.',
'impact': {'data_compromised': 'Personally identifiable information (PII) '
'including full names and Social Security '
'numbers',
'identity_theft_risk': 'High',
'legal_liabilities': 'Potential claims under evaluation'},
'investigation_status': 'Completed',
'references': [{'source': 'Shamis & Gentile P.A.'}],
'regulatory_compliance': {'legal_actions': 'Potential claims under evaluation',
'regulatory_notifications': 'Reported to relevant '
'government agencies'},
'response': {'communication_strategy': 'Written notifications to affected '
'individuals',
'containment_measures': 'Affected systems taken offline',
'incident_response_plan_activated': 'Yes',
'third_party_assistance': 'Cybersecurity experts'},
'title': 'CSEA Local 1000 Data Breach Exposes Sensitive Information of Over '
'47,000 Individuals',
'type': 'Data Breach'}