On October 4, 2020, J.C. Cannistraro, LLC suffered a data breach due to an external system hacking incident. The breach compromised sensitive personal information, specifically Social Security numbers, affecting a total of 1,660 individuals, including four residents of Maine. The incident was formally reported to the Maine Office of the Attorney General on December 17, 2020, nearly two months after the breach occurred. The exposure of Social Security numbers—highly sensitive identifiers—poses significant risks, including identity theft, financial fraud, and long-term reputational harm to the affected individuals. While the breach did not involve ransomware or a full-scale operational disruption, the compromise of such critical data elevates the severity due to the potential for severe financial and personal consequences for victims. The delay in reporting may have further exacerbated risks, as affected individuals remained uninformed and unable to take preventive measures during the interim period. As a construction and mechanical services firm, J.C. Cannistraro’s breach underscores vulnerabilities in third-party or external system security, highlighting the need for robust cybersecurity protocols to prevent unauthorized access to sensitive employee and customer data.