[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$f1fh79qpieeyu4":3},{"success":4,"breach":5},true,{"_id":6,"name":7,"title":8,"slug":9,"domain":10,"breachDate":11,"addedDate":12,"modifiedDate":12,"contentUpdatedAt":12,"source":13,"sourceUrl":14,"sourceUrls":15,"pwnCount":18,"affectedCount":18,"affectedCountStatus":19,"affectedCountLowerBound":18,"affectedCountUnit":20,"hasEnglishDescription":4,"severity":21,"dataClasses":22,"description":35,"seoTitle":36,"seoTitleEn":8,"seoDescription":36,"seoDescriptionEn":37,"logoUrl":38,"isVerified":4,"isSensitive":4,"isSpamList":39,"isMalware":39,"company":40},"6a6f6f3faf96d0c0968f6311","QuantumHealth2026","Quantum Health 2026 Data Breach","quantum-health-2026","quantum-health.com","2026-05-29T00:00:00.000Z","2026-08-02T16:24:31.114Z","Phishing","https:\u002F\u002Fwww.classaction.org\u002Fmedia\u002Fquantum-health-data-breach-letter-2026.pdf",[14,16,17],"https:\u002F\u002Fwww.mass.gov\u002Fdoc\u002Fdata-breach-report-2026\u002Fdownload","https:\u002F\u002Fwww.classaction.org\u002Fdata-breach-lawsuits\u002Fquantum-health-july-2026",null,"unknown","people","Unknown",[23,24,25,26,27,28,29,30,31,32,33,34],"Names","Social security numbers","Health insurance information","Medical information","Treatment information","Diagnoses","Prescription information","Provider names","Dates of birth","Email addresses","Physical addresses","Phone numbers","\u003Cp>\u003Cstrong>The Quantum Health 2026 data breach\u003C\u002Fstrong> followed a user responding to a voice-phishing call that led to unauthorized access to the organization's information-technology network. Between May 29 and June 1, 2026, the unauthorized party accessed and acquired files from certain systems.\u003C\u002Fp>\n\u003Cp>Quantum Health detected the incident during a June 1 service outage. Its investigation found that health, insurance, identity, and contact information may have been involved; the organization has not publicly disclosed a total affected-person count.\u003C\u002Fp>\n\u003Ch2>How Was the Quantum Health Incident Confirmed?\u003C\u002Fh2>\n\u003Cp>Quantum Health's official letter to affected individuals provides the access period, voice-phishing cause, file acquisition, investigation dates, and potential data categories.\u003C\u002Fp>\n\u003Cp>The Massachusetts Office of Consumer Affairs and Business Regulation records the notice in its official July 30, 2026 report. ClassAction.org separately summarizes the dates and data scope contained in the organization's letter.\u003C\u002Fp>\n\u003Ch2>What Happened Between May 29 and June 1?\u003C\u002Fh2>\n\u003Cp>Quantum Health determined that a user responded to a voice-phishing call on May 29, leading to unauthorized network access. The unauthorized party viewed and acquired certain files through June 1.\u003C\u002Fp>\n\u003Cp>The organization detected an outage affecting certain internal and external systems on June 1, secured and isolated its systems, and began an investigation with outside forensic experts. It determined on July 8 that the files contained personal information.\u003C\u002Fp>\n\u003Ch2>What Information May Have Been Affected?\u003C\u002Fh2>\n\u003Cp>The affected files may contain names, Social Security numbers, dates of birth, email addresses, physical addresses, phone numbers, and demographic information. Insurance policy numbers and claims or benefits information may also be involved.\u003C\u002Fp>\n\u003Cp>Health data may include medical information, treatment information, diagnoses, prescriptions, provider names, and dates of service. The notice indicates that the fields vary by person: a name may appear with one or more additional data elements, rather than every category appearing for everyone.\u003C\u002Fp>\n\u003Ch2>Why Is the Affected-Person Count Undisclosed?\u003C\u002Fh2>\n\u003Cp>Quantum Health sent notification letters but did not publish a total number of people potentially affected by the incident. No person count is inferred from file volume, membership, or the number of customers served.\u003C\u002Fp>\n\u003Cp>The one person in the Massachusetts report is only the resident count reported for that state, not the incident's nationwide total. A separate February Quantum Health entry in the same report predates this event and is not combined with the May–June access incident.\u003C\u002Fp>\n\u003Ch2>How Did Quantum Health Respond?\u003C\u002Fh2>\n\u003Cp>After identifying the outage, the organization secured and isolated systems, engaged outside forensic experts, and conducted restoration work while continuing to support customers and members. It also said it was strengthening existing security protocols.\u003C\u002Fp>\n\u003Cp>Potentially affected people are being offered complimentary identity monitoring, credit monitoring, fraud consultation, and identity-theft restoration services. The service period and enrollment deadline are provided in each recipient's letter.\u003C\u002Fp>\n\u003Ch2>What Should Affected People Do?\u003C\u002Fh2>\n\u003Cp>If you received a notice, check its activation deadline and enroll in the offered monitoring service. If your Social Security number is in scope, review your credit reports and consider a fraud alert or credit freeze.\u003C\u002Fp>\n\u003Cp>Monitor insurance explanations, healthcare claims, and financial accounts for unfamiliar activity. Verify unexpected messages claiming to represent Quantum Health, an insurer, or the monitoring provider through an official channel before following a link.\u003C\u002Fp>","","A Quantum Health vishing incident may have exposed identity, contact, insurance, and health data; the total affected-person count is undisclosed.","https:\u002F\u002Fqhsite.cdn.prismic.io\u002Fqhsite\u002FaTIEJXNYClf9n1wF_QH-icon.svg",false,{"name":41,"sector":42,"country":43,"website":10,"websiteArchiveUrl":36,"websiteStatus":44,"websiteCheckedAt":12},"Quantum Health","Healthcare","United States","active"]