Knox McLaughlin Gornall Sennett Data Breach Lawsuit Investigation
On October 8, 2025, the law firm Knox McLaughlin Gornall Sennett confirmed an email-account intrusion that compromised personal information belonging to four individuals. If you received a breach letter, you may be entitled to complimentary credit monitoring and could explore potential legal remedies.
Download Official Breach Notice (PDF)
Incident Overview
Knox McLaughlin Gornall Sennett, P.C. (“Knox McLaughlin Gornall Sennett”) detected suspicious activity in one employee’s email account on May 14, 2025. The firm engaged cybersecurity specialists, confirmed the event was isolated, and determined that certain files were accessed or acquired without authorization on May 19, 2025. A comprehensive mailbox review later revealed that files containing sensitive personal data were involved. The firm states it has no evidence of misuse of the information to date.
Key Dates
- Breach window: May 14 – May 19, 2025
- Discovery date: May 14, 2025
- Consumer notices mailed: October 7, 2025
- Incident reported to Montana Attorney General: October 8, 2025
Data Exposed
The following categories of information were contained in the impacted files:
- Name
- Social Security number
- Driver’s license number
- Health-insurance policy number
- Medical condition or treatment details
Scope of Impact
The firm’s regulatory filing indicates that 4 individuals in Montana were affected.
Company Response
After identifying the incident, the firm:
- Secured the impacted mailbox and engaged third-party cybersecurity experts.
- Implemented additional security measures to reduce the risk of a similar event.
- Notified affected individuals and regulators.
- Offered 12 months of Single-Bureau Credit Monitoring, Credit Report, and Credit Score services through Cyberscout (a TransUnion company) at no cost.
How to Activate Your Free Credit Monitoring
- Visit bfs.cyberscout.com/activate.
- Enter unique code: 77F4147F7735.
- Complete enrollment within 90 days of the notification letter.
An internet connection and email account are required. The service is not available to individuals under 18.
Your Legal Rights & Options
If your Social Security number or medical information was exposed, you may:
- Seek legal counsel to determine whether you can pursue a data-breach lawsuit or join an existing action.
- Request documentation of any expenses or time spent dealing with potential fraud.
- Monitor credit reports and health-insurance statements for unfamiliar activity.
Next Steps for Impacted Individuals
Knox McLaughlin Gornall Sennett recommends that affected people:
- Enroll in the complimentary Cyberscout services.
- Place a fraud alert or security freeze on their credit files, if desired.
- Review the firm’s detailed “What You Can Do” recommendations included in the breach letter.
Company Overview
Website: kmgslaw.com
- Industry: Law Firm
- Headquarters: 120 West 10th Street, Erie, PA, USA
- Year founded: 1958
- Team: Approximately 40 attorneys, 25 paralegals, and dedicated support staff
- Facebook: /KnoxMcLaughlinGornallSennettPC
- LinkedIn: Company Page
Frequently Asked Questions
- I received a data breach letter from Knox McLaughlin Gornall Sennett — what should I do?
- Follow the enrollment instructions for the free Cyberscout credit-monitoring service within 90 days, monitor your financial and medical accounts, and consider speaking with a data-privacy attorney.
- How do I submit a claim related to the Knox McLaughlin Gornall Sennett data breach?
- Gather your breach letter, any evidence of fraud or costs incurred, and consult an attorney handling data-breach matters to evaluate potential claims.
- Am I eligible to join a lawsuit against Knox McLaughlin Gornall Sennett?
- Eligibility typically depends on whether your personal information was involved and if you suffered damages. An attorney can assess your specific situation.
- What information did the Knox McLaughlin Gornall Sennett breach expose?
- Name, Social Security number, driver’s license number, health-insurance policy number, and medical condition or treatment information.
- Did Knox McLaughlin Gornall Sennett offer credit monitoring, and for how long?
- Yes. The firm is providing 12 months of Single-Bureau Credit Monitoring, Credit Report, and Credit Score services through Cyberscout at no charge.
- How many people were affected by the Knox McLaughlin Gornall Sennett breach?
- The firm’s filing with the Montana Attorney General lists a total of 4 impacted individuals.
- How can I get the official breach notice (PDF) for Knox McLaughlin Gornall Sennett?
- You can download it directly from the Montana Attorney General’s website using the “Download Official Breach Notice” button above.