Got a data breach letter from Cohesity?
Dapeer Law, P.A. is investigating a potential class action against Cohesity, a Santa Clara, California company that is the plan sponsor and successor to the self-funded group health plan formerly maintained by Veritas Technologies LLC. The investigation is on behalf of former Veritas plan members whose information may have been involved in a May 2026 data security incident at the plan's former vendor, Quantum Health.
Latest on the Cohesity data breach
- : Dapeer Law opened its investigation following notice filings posted by the New Hampshire Attorney General.
Who qualifies for the Cohesity data breach investigation
You may be eligible to participate in a class action if any of the following applies:
- You received a data breach notification letter from Quantum Health about the former Veritas plan, for which Cohesity is plan sponsor and successor.
- Your letter offered free Kroll monitoring. For adults, this includes single bureau credit monitoring. For minors, it includes minor identity monitoring.
- According to Cohesity's New Hampshire filing, Quantum Health sent the letters on behalf of its affected clients, and Cohesity accepted that offer for members of the group health plan formerly maintained by Veritas Technologies LLC.
- No proof of harm required to consult with counsel. You do not need to have already suffered identity theft to explore your legal options.
- Excluded: individuals who did not receive a breach notice and whose information was not involved in the incident.
Not sure if you qualify?
Send us your notice, we'll confirm your eligibility at no cost.
What happened in the Cohesity data breach
Cohesity told the New Hampshire Attorney General that it is the plan sponsor and successor to the self-funded group health plan formerly maintained by Veritas Technologies LLC. According to that filing, Quantum Health, Inc. provided healthcare navigation and care coordination services to members of the Veritas plan until approximately 2021.
According to the notice letter, Quantum Health detected a service outage on June 1, 2026. Its investigation determined that the outage was related to unauthorized access to its IT network, resulting from a user responding to a vishing call on May 29, 2026. The letter states that between May 29, 2026 and June 1, 2026, the unauthorized party accessed and acquired files from certain Quantum Health systems. Cohesity's filing adds that ransomware was deployed on June 1, 2026, and that the most recent evidence of unauthorized activity was on June 3, 2026.
The notice letter filed with the New Hampshire Attorney General states that some of the files involved contained the recipient's name and one or more of the following: health insurance information (such as insurance policy number or claims/benefits information), health information (such as medical information, treatment information, diagnoses, prescriptions, provider names, and dates of service), and other personal information (such as date of birth, email, address, phone number, or demographic information). Quantum Health also could not rule out the possibility that the recipient's Social Security number was involved. Cohesity's filing says it was unclear whether the data for New Hampshire residents was limited to name and email address, so Cohesity treated all of these categories as potentially affected.
Cohesity's filing states that Quantum Health notified it of the incident on July 29, 2026. It also says Cohesity sent written questions on August 3, 2026, and received Quantum Health's written responses and forensic report on September 18, 2026. An updated list of potentially affected individuals followed on October 5, 2026. Cohesity's October 7, 2026 notice to the New Hampshire Attorney General reports two New Hampshire residents. It came more than four months after Quantum Health detected the incident. Whether the protection of plan member information met legal standards, and whether the timing of notice caused additional harm, are among the issues being evaluated.
What to do if you got a Cohesity data breach letter
Keep your notice letter
Do not discard it. Your letter contains the Kroll activation code and verification ID. It is also important evidence if you decide to participate in a lawsuit.
Activate the free Kroll monitoring
Activate the Kroll monitoring described in your letter before the activation deadline printed in it. The New Hampshire filing says adults are offered 12 months of credit monitoring and identity restoration, and minors are offered identity monitoring. Accepting this benefit does not waive your right to pursue legal action.
Place a fraud alert or credit freeze
Contact Equifax, Experian, and TransUnion to place a fraud alert or freeze on your file. Request a free weekly credit report from AnnualCreditReport.com, and use the FTC's IdentityTheft.gov recovery guide.
Speak with a data breach attorney
Consultations with Dapeer Law are free and confidential. We'll review your notice, explain your options, and advise whether you may be eligible to join a class action.
Submit your notice for a free review
Two minutes online. A licensed attorney reviews every submission.
Cohesity breach timeline
Compensation you may be entitled to
Out-of-pocket expenses
Credit freezes, identity restoration services, and other costs incurred responding to the breach.
Time spent monitoring
Hours spent reviewing accounts, disputing fraudulent charges, and dealing with identity theft issues.
Identity theft & fraud losses
Unreimbursed funds stolen from accounts, unauthorized credit lines, or tax refund fraud tied to the breach.
Statutory damages
Certain state data breach and consumer protection statutes provide for fixed damages regardless of actual loss.
Injunctive relief
Court orders requiring stronger protection of health plan member information, including safeguards for third-party vendors that hold it.
Compensation categories depend on applicable state law, the types of data exposed, and documented losses. No recovery is guaranteed.
Cohesity data breach FAQ
I received a data breach letter from Cohesity. What should I do? +
Keep the letter. Activate the free Kroll monitoring before the deadline printed in your notice, and place a fraud alert or credit freeze. Cohesity's filing also encourages reviewing account statements and explanations of benefits. Then contact a data breach attorney for a free consultation. Accepting the monitoring does not waive your right to sue.
Is the Cohesity data breach letter real or a scam? +
Cohesity has reported this incident to the New Hampshire Attorney General. Compare your letter to the official filing linked in Sources below, and use only the enrollment website and phone number printed in your letter. Be cautious of unexpected calls, texts or emails about the breach that ask for your Social Security number or account login. If you are unsure, send your letter to Dapeer Law for a free review.
Am I eligible to join a class action against Cohesity? +
If you received a Quantum Health notice letter about this incident and your information relates to the group health plan formerly maintained by Veritas Technologies LLC, you are likely eligible for a free case evaluation. Eligibility depends on your state of residence, the categories of your data that may have been involved, and any losses you have suffered. Dapeer Law will review your notice at no cost.
How much money could I receive from a class action lawsuit? +
Data breach class action recoveries vary significantly. Settlements typically range from a few hundred dollars for basic out-of-pocket losses to several thousand dollars for documented identity theft, with class size, damages, and negotiation all affecting the final amount. No payout is guaranteed, and this investigation has not yet resulted in a settlement.
What personal information was exposed in the breach? +
The notice letter filed with the New Hampshire Attorney General states that some of the files involved contained your name and one or more of the following: health insurance information (such as insurance policy number or claims/benefits information), health information (such as medical information, treatment information, diagnoses, prescriptions, provider names, and dates of service), and other personal information (such as date of birth, email, address, phone number, or demographic information). Quantum Health could not rule out the possibility that your Social Security number was also involved. Cohesity's filing says Quantum Health did not assess the data person by person, so Cohesity treated all of these categories as potentially affected.
Did Cohesity offer free credit monitoring? +
Yes. Cohesity's New Hampshire filing says adults are offered 12 months of complimentary credit monitoring and identity restoration through Kroll, and minors are offered identity monitoring. For adults, the letter describes single bureau credit monitoring, fraud consultation, and identity theft restoration. For children, it describes minor identity monitoring, fraud consultation, and identity theft restoration. Activate before the deadline printed in your letter. Enrollment does not waive your right to pursue a claim.
How many people were affected by the Cohesity breach? +
Cohesity's filing with the New Hampshire Attorney General reports two New Hampshire residents. A total number of affected individuals has not been disclosed in the sources reviewed for this page. This page will be updated as more information becomes available.
Is there a deadline to take legal action? +
Yes. Statutes of limitations for data breach claims vary by state and legal theory, typically ranging from one to six years. Waiting can permanently bar your claim. Contact us as soon as possible for a free evaluation.
How do I get a copy of the official breach notice? +
Cohesity's notice to the New Hampshire Attorney General, including the sample letters, is posted by the New Hampshire Attorney General and linked in Sources below. If you received a letter but no longer have it, Dapeer Law can help you obtain a copy during your free consultation.
Sources & references
- Official breach notice filing · New Hampshire Attorney General, Cohesity, Inc. data breach notice (Oct 7, 2026)
- Company · Cohesity, Inc. (cohesity.com)
- Credit bureau freezes · Equifax · Experian · TransUnion
- Free weekly credit reports · AnnualCreditReport.com
- Identity theft recovery guide · FTC IdentityTheft.gov
Don't let the deadline decide for you. Submit your claim today.
You only have a limited window to act. Our team will review your notice, explain your options, and tell you whether you may be eligible to recover compensation, at no cost to you.
