Mario Susi & Son Data Breach: At Least 175 Affected
The 2026 Mario Susi & Son data breach is a ransomware attack that the company says occurred on or about June 13, 2026.
This classification is based on a reviewed lower bound; the actual impact and severity may be higher.
Exposed Data Types
1- Employment details
About This Breach
The company stated that the incident may have involved unauthorized access to or acquisition of former employees' personal payroll-related information. A published summary of the Massachusetts filing identifies at least 175 state residents as affected; the nationwide total was not disclosed.
Mario Susi & Son is an excavation and construction contractor based in Dorchester, Massachusetts. Because the public notice was sent to former employees, the confirmed scope concerns employment and payroll information held by the company rather than customer data.
How Did the Incident Occur?
According to the company's letter dated July 1, 2026, Mario Susi & Son experienced a ransomware attack on or about June 13. The notice does not identify the attacker, explain the initial access method, state how long access lasted, or name the systems that were encrypted. The available public information therefore does not establish a more detailed technical scope.
What Information Was Affected?
The official letter describes the potentially affected material as “personal payroll-related information” but does not enumerate individual data fields. That wording supports employment and compensation records; the public letter does not establish that a Social Security number, financial account, or any other specific field was affected for every person.
How Did Mario Susi & Son Respond?
The company notified affected former employees and offered 24 months of complimentary credit monitoring with identity-theft insurance through IDX. The letter also outlined protective options including credit freezes, fraud alerts, and reporting suspicious activity.
What Should Affected People Do?
Notice recipients should rely on the scope stated in their individual letters and be cautious with unexpected messages involving payroll, taxes, or employment history. Credit reports and financial accounts may be monitored for unfamiliar activity, and links claiming to be from the company or monitoring provider should be verified through the msusi.com domain or the contact information in the official letter before use.
Verification and editorial method
LeakData compares the incident name, date, affected-record count, and exposed data types with accessible sources. Unverified fields are not presented as facts, and records are updated when new evidence becomes available.
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