Where does the Coston and McIsaac, CPAs case file come from?

Every entry is taken from the breach report Coston and McIsaac, CPAs lodged with the Massachusetts Attorney General. Nothing here is estimated.

Why do the incident date and the report date differ?

Companies usually investigate before they report. The gap between the two dates shows how long that took.

What does the records-affected figure count?

It is the number the company gave the state. It can cover residents of that state only, so the national total may be higher.

Does this case file change over time?

Yes. When a company files an update or a new state publishes its copy of the report, the dates and counts here are refreshed.

Case file

Case File: Coston and McIsaac, CPAs Data Breach

This file collects the dated facts on record for the Coston and McIsaac, CPAs incident. The state report is dated April 17, 2025.

Timeline

April 17, 2025Report filed in MassachusettsDate the notice was lodged with the Massachusetts Attorney General.

Case facts

Filing state: Massachusetts
Date reported: April 17, 2025
Receiving office: Massachusetts Attorney General

Case notes

Coston and McIsaac, CPAs, a financial services firm operating in Massachusetts, officially reported a data security incident to the state's Attorney General's Office on April 17, 2025. The firm, which handles sensitive corporate and individual accounts, acknowledged that an unauthorized event led to the potential exposure of personal information.

Due to the nature of their business, accounting firms like Coston and McIsaac routinely manage extensive quantities of private financial records and identifying details. Their digital systems often serve as centralized repositories for highly critical and personal financial data entrusted to them by clients.

While the specific details regarding the breach's cause and the precise scope of the compromised information remain under investigation, the firm has indicated that personal information was involved. Such incidents can often stem from unauthorized network access or vulnerabilities exploited by external parties seeking to gain access to sensitive systems.

Individuals who receive a direct notification from Coston and McIsaac, CPAs should carefully review the information provided. It is generally advisable to remain vigilant for any unusual account activity, such as suspicious transactions or unexpected communications. Regularly monitoring your financial statements and credit reports for any irregularities is a prudent step.

Implementing strong, unique passwords for online accounts and enabling multi-factor authentication wherever possible can add significant layers of security. Additionally, be cautious of unsolicited emails, calls, or texts, as these could be phishing attempts designed to exploit information that may have been compromised during the incident.

Questions about this case file

Where does the Coston and McIsaac, CPAs case file come from?: Every entry is taken from the breach report Coston and McIsaac, CPAs lodged with the Massachusetts Attorney General. Nothing here is estimated.
Why do the incident date and the report date differ?: Companies usually investigate before they report. The gap between the two dates shows how long that took.
What does the records-affected figure count?: It is the number the company gave the state. It can cover residents of that state only, so the national total may be higher.
Does this case file change over time?: Yes. When a company files an update or a new state publishes its copy of the report, the dates and counts here are refreshed.

Massachusetts data breaches

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Timeline

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