Sermo Data Breach Lawsuit Investigation
On February 9, 2026, Sermo began notifying individuals that an unauthorized actor accessed and exfiltrated certain files from its network. If you received a letter about this incident, you could be entitled to financial compensation and identity-theft protection assistance. Use the form on this page to discuss your legal options at no cost.
What Happened?
WorldOne Inc. dba Sermo (“Sermo”) detected suspicious activity inside its network on April 10, 2024. A forensic investigation confirmed that an unauthorized actor accessed and acquired data between March 19 – April 10, 2024. Sermo secured its systems immediately and engaged external cybersecurity professionals to assist.
Information Exposed
According to the notice filed with the Maine Attorney General, the compromised files included affected individuals’ first and last names plus additional personal data elements. The exact data elements were not specified in the letter template released by Sermo.
Steps Sermo Is Taking
Reviewed and updated existing network security policies.
Implemented additional safeguards to defend against evolving threats.
Offering complimentary identity-monitoring services through Kroll, which include credit monitoring, fraud consultation, and identity-theft restoration.
What You Can Do Now
Even if you have not detected fraud, remain vigilant by regularly reviewing bank, credit-card, and insurance statements. Promptly dispute any unfamiliar charges. Sermo’s letter also outlines additional protective steps and free resources available from the major credit bureaus.
Key Dates
Breach period: March 19 – April 10, 2024
Breach discovered: April 10, 2024
Consumer notification mailed: February 9, 2026
Company Overview
WorldOne Inc. dba Sermo (Sermo) is a healthcare data collection and insights platform headquartered at 9 Crosby St, Floor 2, New York, NY, USA. Founded in 2000, Sermo employs roughly 501–1,000 people and operates as a subsidiary of WorldOne. Visit its official website or review its Terms of Service & Privacy Policy for additional information.
Industry: Healthcare Data Collection and Insights
Parent company: WorldOne
Sources
Impacted Entities
Frequently Asked Questions
I received a data breach letter from Sermo — what should I do?
Follow the enrollment instructions for the complimentary Kroll identity-monitoring service and watch your financial accounts closely. Consider consulting a data-breach attorney about your rights.
How do I submit a claim related to the Sermo data breach?
Complete the contact form on this page to have your claim reviewed. An attorney will explain eligibility and next steps at no cost.
Am I eligible to join a lawsuit against Sermo?
You may qualify if you received Sermo’s breach notice dated February 9, 2026. Eligibility is typically based on whether your data was confirmed in the compromised files.
What information did the Sermo breach expose?
The notice confirms first and last names plus unspecified additional personal data elements. No payment-card or medical details were listed in the publicly filed template.
Did Sermo offer credit monitoring, and for how long?
Yes. Sermo is providing complimentary identity-monitoring services through Kroll. The letter did not specify the duration.
How can I get the official breach notice (PDF) for Sermo?
You can download it directly from the Maine Attorney General’s website using the button above.
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