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Musarubra US LLC dba Trellix data breach investigation

Musarubra US LLC, operating as Trellix, reported a data security incident in Indiana affecting personal and corporate data. This breach is concerning because Trellix is a cybersecurity firm, and the exposed data could lead to serious risks like identity theft and corporate espionage for those affected. Our firm is investigating the company's security practices.

Filed
August 28, 2026
Regulator
Indiana AG
People affected
Not stated
File status
Monitoring

What the filing confirms

  • Musarubra US LLC dba Trellix reported the incident to the Indiana Attorney General.
  • Information involved: Full Name, Email Address, Password or Credential Hash, Mailing Address, Phone Number, Employment and Professional Title, Corporate Account History, Internal System Access Logs.

Still unknown

  • How many people were affected. The filing does not give a number.
  • What caused the incident beyond the description in the filing.
  • How the attackers got in, and whether basic safeguards such as multi-factor sign-in were in place.
Read the filing at the source

Investigation notes

Musarubra US LLC, known as Trellix, formally reported a data security incident to Indiana authorities. The company confirmed that a breach occurred on February 28, 2026, with the official filing made several months later on August 28, 2026. As a critical cybersecurity provider, this event prompts a closer look into the security posture of an entity entrusted with protecting sensitive digital assets.

The breach report specifies that various categories of sensitive information were exposed. This includes individuals' Full Name, Email Address, Password or Credential Hash, Mailing Address, Phone Number, Employment and Professional Title, Corporate Account History, and Internal System Access Logs. The combination of these data types creates significant downstream risks for those impacted.

Exposure of personal identifiers such as names, addresses, and phone numbers can directly contribute to identity theft or targeted phishing scams designed to trick individuals into revealing further sensitive information. Furthermore, the compromise of credential hashes and internal system access logs could have broader implications, potentially impacting professional accounts and corporate environments. This makes monitoring your accounts critically important.

Given Trellix's core business revolves around digital security, the company had a clear legal obligation to implement robust safeguards to protect the data in its custody. The occurrence of this security incident suggests potential failures in upholding these standards, whether through inadequate network segmentation, delayed patch management, or insufficient monitoring. Our firm is investigating Trellix's conduct, including the sufficiency of its security measures, the duration of unauthorized access, and the timeliness of its notification.

If you received a data breach notification letter from Musarubra US LLC dba Trellix, it confirms your information was compromised in this incident. We advise you to remain vigilant for any suspicious activity across your accounts and consider updating passwords for any services that might share credentials. The receipt of this notice also provides you with legal standing to potentially seek recourse.

Our firm is actively investigating the Trellix data breach to assess the full scope of potential liabilities. If your data was exposed, we offer a confidential, no-cost review of your situation to discuss your legal options. There are no out-of-pocket fees, and we only receive payment if we successfully recover compensation on your behalf.

What our attorneys examine

A cyberattack does not excuse a company from protecting the information it holds. We look at whether Musarubra US LLC dba Trellix used reasonable security, how long it kept the data, and how quickly it told the people affected. Those questions decide whether a class action or individual claim is possible. Read more on how ransomware lawsuits work, or browse other incident files in Indiana.

Musarubra US LLC dba Trellix data breach questions

How many people were affected by the Musarubra US LLC dba Trellix data breach, and what was exposed?
The filing does not give a count of affected people and lists the following information as involved: Full Name, Email Address, Password or Credential Hash, Mailing Address, Phone Number, Employment and Professional Title, Corporate Account History, Internal System Access Logs. Your own letter is the best guide to what was exposed about you, since notices are usually tailored to each person.
Is the Musarubra US LLC dba Trellix data breach letter legit or a scam?
A notice from Musarubra US LLC dba Trellix in the mail matches the breach Musarubra US LLC dba Trellix reported to the Indiana Attorney General on August 28, 2026. Check that the company name and dates in your letter match that filing. A real notice of data security incident won't ask for your password, Social Security number or a payment — if it does, contact Musarubra US LLC dba Trellix through a phone number or website you find yourself.
Did Musarubra US LLC dba Trellix offer free credit monitoring?
Any free monitoring Musarubra US LLC dba Trellix is offering will be described in the notice you received, along with an activation code and a sign-up deadline. Because financial or account details are listed in this filing, watch your bank and card statements closely as well. Using the free service won't stop you from joining a lawsuit or settlement later.
Is there a Musarubra US LLC dba Trellix data breach class action lawsuit?
Law firms often open an investigation after a breach notice like this one, and a class action lawsuit may follow. This page doesn't confirm that a lawsuit has been filed against Musarubra US LLC dba Trellix. You usually don't have to join a class action to be included — if a settlement is reached, class members are notified and can file a claim.
What should I do after getting the Musarubra US LLC dba Trellix data breach notice?
Keep the letter and the envelope, and note the date it arrived. Freeze your credit with Equifax, Experian and TransUnion, change any passwords the notice mentions, and sign up for any free credit monitoring the letter offers. Then check whether you may have a claim.
Where can I see the official Musarubra US LLC dba Trellix breach notice?
Musarubra US LLC dba Trellix's report is published by the Indiana Attorney General: https://www.in.gov/attorneygeneral/consumer-protection-division/id-theft-prevention/security-breaches/#musarubra-us-llc-dba-trellix-2026 Compare it with the letter you received to confirm the dates and details match.
Do I need a Musarubra US LLC dba Trellix data breach lawyer or attorney?
An attorney can read your notice and tell you whether a claim makes sense. A case review here is free, and data breach cases are usually handled on contingency, so there is no upfront cost.
Can I sue Musarubra US LLC dba Trellix over the data breach?
It depends on what was exposed, the law in Indiana and your own state, and whether you've been harmed. Most people take part through a class action rather than suing alone. Keep your notification letter — it's the proof that connects you to the breach.
How much could a Musarubra US LLC dba Trellix data breach settlement or claim be worth?
There is no set amount, and no Musarubra US LLC dba Trellix settlement is confirmed here. In past data breach settlements, payments depended on what data was exposed and on documented losses — fraud, out-of-pocket costs and time spent dealing with the breach. The filing lists Full Name, Email Address, Password or Credential Hash as involved. Keep receipts and records; they're what damages claims are built on.

Other open files in Indiana

Attorney advertising. An incident file reflects a public regulator filing and our review of it; it does not mean a lawsuit has been filed or that the company did anything unlawful. Submitting a review request does not create an attorney-client relationship.