Nearly 50,000 CSEA Members Affected by Data Security Breach

The New York–based Civil Service Employees Association said a data security incident it experienced last year compromised the sensitive personal information of nearly 50,000 members.

 

Civil Service Employees Association, Inc., Local 1000 is a labor union representing more than 200,000 public and private sector workers across New York State, including both active and retired employees. With a total membership exceeding 250,000, it is regarded as the state’s largest and most influential union.

 

In a data security incident notice filed with the Office of Maine Attorney General, CSEA reported that on May 30, it detected unauthorised access within its internal network. The association immediately launched an investigation, with assistance from external cyber security experts, to determine the nature and scope of the incident. 

 

It took immediate action to secure the affected network, including containing the incident, proactively taking systems offline, resetting passwords, deploying advanced security and threat-detection tools, securely restoring systems from backups, and notifying relevant law enforcement authorities.

 

“ The investigation determined that there was unauthorised access to our systems between May 3, 2025 and May 31, 2025. During this time period we identified that files containing your Information were obtained by an unauthorised party,” CSEA said.

 

The compromised data included names and other personal identifiers including Social Security Numbers.The filing with the Maine state regulator’s office also states that CSEA has identified 47,352 individuals affected by the incident.

 

While the labour union found no evidence of the compromise data being misused, it has advised all affected individuals to regularly monitor their credit reports, account and benefit statements and report any suspicious activity to law enforcement authorities, including the police and the state attorney general. 

 

At the time of publishing, no known hacker group claimed responsibility for the cyber attack on CSEA. The association also did not share details on who was behind the attack, how much data was compromised, or whether it had received a ransom demand.