The Maine Office of the Attorney General disclosed on May 19, 2022, that M3 Accounting Systems suffered a data breach due to unauthorized access to its systems between October 13 and October 19, 2021. The incident exposed personal information, including names and Social Security Numbers (SSNs), of 1,789 individuals, with at least one confirmed Maine resident affected. While the breach scope was limited in terms of sensitive data types (primarily SSNs and names), the exposure of such personally identifiable information (PII) poses a high risk of identity theft and fraud. In response, M3 Accounting Systems issued written notifications to impacted individuals and offered 12 months of free identity theft protection services through IDX, a third-party provider. The breach did not involve ransomware, financial theft, or operational disruption, but the compromise of SSNs—a critical identifier for financial and governmental authentication—elevates the severity due to long-term fraud risks. The company’s proactive measures (notification and credit monitoring) aimed to mitigate harm, though the incident underscores vulnerabilities in safeguarding sensitive client data within accounting systems, which often handle high-value financial and personal records.