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Musarubra US LLC dba Trellix was the subject of a data breach notification filed with the IN Attorney General. The AG filing was recorded on August 28, 2026. The breach or discovery date reported in the filing is February 28, 2026.
From the AG filing description
Musarubra US LLC, operating under the well-known cybersecurity brand Trellix, occupies a critical position in the modern digital infrastructure landscape as an enterprise security software and threat intelligence provider. Because of its core business model protecting Fortune 500 corporations, government agencies, and critical infrastructure, Trellix routinely aggregates, processes, and stores vast quantities of highly sensitive proprietary and personal data. This repository includes internal corporate records, advanced endpoint telemetry, system configuration files, proprietary threat research, employee credentials, and extensive customer contact and account information necessary to deliver comprehensive extended detection and response (XDR) solutions. In 2026, Musarubra US LLC dba Trellix reported a significant data security incident to the Indiana Attorney General, triggering widespread concern regarding the security posture of enterprise security vendors. While cybersecurity firms maintain rigorous defensive perimeters, breaches of this magnitude typically involve sophisticated threat actors exploiting zero-day vulnerabilities, executing targeted supply chain compromises, or leveraging compromised third-party vendor platforms to bypass authentication controls and infiltrate internal database environments where sensitive corporate and personal assets are archived. The exposure resulting from this security failure encompasses a dangerous combination of corporate, technical, and personally identifiable information. Compromised data categories likely include full names, corporate and personal email addresses, encrypted credential hashes, internal system access logs, administrative contact details, and potentially employee or customer financial and tax identifiers. The exposure of administrative credentials and network architecture data creates severe downstream risks, including corporate espionage, lateral network intrusion, and persistent phishing campaigns, while compromised personal identifiers expose affected individuals to immediate risks of identity theft, unauthorized account takeovers, and fraudulent financial schemes. As a premier provider of digital security products entrusted with protecting critical digital assets, Musarubra US LLC dba Trellix was bound by stringent legal, statutory, and common-law duties to implement robust administrative, physical, and technical safeguards to secure the information in its custody. Under state data protection statutes, the Indiana Deceptive Consumer Sales Act, and applicable Federal Trade Commission (FTC) guidelines governing unfair and deceptive trade practices, the company had an affirmative obligation to maintain reasonable security measures commensurate with the sensitivity of the data it holds. The occurrence of this security incident strongly suggests a failure to uphold these core cybersecurity standards, potentially through inadequate network segmentation, delayed patch management, or insufficient monitoring of third-party integrations. Receiving a data breach notification letter from Musarubra US LLC dba Trellix serves as formal legal notice that your confidential information was compromised due to corporate negligence. Under modern data breach jurisprudence, the receipt of such a notification provides affected individuals with the requisite legal standing to participate in a class action lawsuit aimed at holding the company accountable. Crucially, victims do not need to demonstrate that they have already suffered actual financial loss or identity theft to pursue legal remedies; the mere exposure and increased risk of future harm are sufficient to support legal claims. Our firm is actively investigating this breach and handles all class action claims on a strict contingency fee basis, meaning you pay absolutely nothing out of pocket and owe no legal fees unless we successfully recover compensation on your behalf.
Based on the data types reported in this filing:
Phone numbers exposed in breaches are used for SIM swapping attacks — hijacking your number to bypass two-factor authentication on financial accounts.
You may have been affected by the Musarubra US LLC dba Trellix data breach if:
Common categories of compensation in data breach class actions
Courts recognize that the time spent monitoring accounts, placing credit freezes, and dealing with the aftermath of a breach has real economic value. This category of damages is recoverable even without direct financial loss.
Direct financial losses resulting from the breach — unauthorized charges, fraudulent transfers, or fees incurred through fraud — are recoverable as compensatory damages. Banks may reverse some charges; a class action recovers the remainder and associated costs.
When login credentials are exposed, the costs of downstream account compromises — password managers, security audits, and recovery costs for hijacked downstream accounts — can be recovered. Courts in recent class actions have awarded damages for credential exposure even without proven misuse.
Data breach victims regularly report anxiety, loss of sleep, and ongoing fear of identity theft. These non-economic harms are cognizable injuries in data breach litigation, particularly in cases involving SSN or medical record exposure.
Note: an attorney general breach filing does not by itself establish a settlement fund, a payment amount, or a claim deadline. If an official settlement notice is later issued, rely on that notice for payment details and deadlines.
Applicable State Law
This breach was reported under the Indiana data breach notification law, which mandates notification and establishes your right to seek damages.
No. Under Indiana data breach notification law and federal law, the unauthorized exposure of your personal data — regardless of whether it has been actively misused — can be sufficient grounds for a claim. The breach itself is the injury.
Nothing. The Law Office of David S. Harris handles data breach cases on contingency — you pay zero upfront and owe nothing unless compensation is recovered.
Banks may reverse fraudulent charges, but they are not obligated to compensate you for time lost, stress, or indirect damages. A class action claim against the breached company can recover those additional categories of harm.
State statutes of limitations for data breach claims typically run 2–4 years from the date of the breach or its discovery. Because this breach was recently disclosed, the window is open — but acting early preserves your options and strengthens the case.
Accepting free credit monitoring from Musarubra US LLC dba Trellix does not waive your right to pursue legal action unless you signed a specific release waiving claims. In most cases, victims who accepted monitoring can still file.
Not necessarily. Many data breach victims are never notified directly. If your personal information was held by Musarubra US LLC dba Trellix during the relevant period, you may still qualify even without receiving a letter. A free eligibility review can confirm your status.
Most data breach class actions resolve within 18 to 36 months, though timelines vary by court and complexity. Your participation requires minimal effort — typically completing a claim form. Our office handles all litigation; you are notified when a settlement is reached.
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