HackingHealthcareTechnologyHealthcareStolen CredentialsData ExfiltratedCustomer Data InvolvedIdentity (basic)Government IDFinancial accountHealth (basic)HighContained

iRhythm Holdings, Inc.

bd_d8d831a62c6cf576 · schema v1 · pii pii-v2

Severity

High

Discovered

Jun 8, 2026

Filed

Oct 6, 2026

To disclose

17 weeks

Affected

69,526state residents only

Confidence

67%

Full breach record for iRhythm Holdings, Inc. →2 incidents on file

iRhythm notified South Carolina residents of a cybersecurity incident involving unauthorized access to third-party hosted business applications. Unauthorized access occurred between June 3 and June 8, 2026. Impacted data included names, contact info, patient insurance numbers, dates of service, and dates of birth. iRhythm engaged external forensic professionals and implemented its incident response plan. No evidence of identity theft was found.

J jump to incidentP pin to compareR raw source

South Carolina clock✓ SC CRA notice due17 weeks discovery → filing

⚠ unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Incident timeline

undetected · 5 days

discovery → filing · 17 weeks / 120 days

Jun 3, 2026

Begins

Jun 8, 2026

Discovered

Oct 6, 2026

Filed

vs. sector median

+8 wks slower

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed69,526 affectedView incident

Name: iRhythm Holdings, Inc.
norm: irhythm holdings

Name: iRhythm Holdings, Inc.
norm: irhythm holdings
Industry: HealthcarellmTechnologyllm

Discovered: Jun 8, 2026
Breach occurred: Jun 3, 2026 – Jun 8, 2026
Undetected for: 5 daysoccurrence → discovery
Materiality determined: —
Notification sent: Oct 2, 2026
Affected individuals: 69,526state-resident count only
Data types: Identity (basic)Government IDFinancial accountHealth (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing Application
Threat actor: External
Initial access: exploit_public_facing

During the incident: Implemented its incident response plan
Working very closely with external cybersecurity professionals experienced in handling these types of incidents
Completed forensic investigation
Carried out a review to determine the nature of the impacted data
Set up a dedicated toll-free response line
Changes made: Continually evaluates and modifies our practices and internal controls to enhance the security and privacy of your personal information
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 17 weeks(120 days from discovery to filing)
Compliance flags: SC CRA notice due
Discovery-date grounding: unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Status: No extraction artifact recorded for this disclosure.

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filingThis record

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://consumer.sc.gov/sites/consumer/files/Documents/Security%20Breach%20Notices/2026/Consumer%20Letter%20-%20iRhythm.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Oct 6, 2026
Raw hash: 32c2d8825d31d1d57e72340cc2d513ac78f682c1649add69023a1329abdf702a

Reporting entityiRhythm Holdings, Inc.

Victim entityiRhythm Holdings, Inc.

Incidentdiscovered Jun 8, 2026

Stated responseImplemented its incident response plan

ComplianceSC CRA notice due

Extraction provenanceno artifact recorded

Source provenanceconsumer.sc.gov