HackingHealthcareTechnologyHealthcareStolen CredentialsData ExfiltratedSupply Chain (3P Vendor)Customer Data InvolvedIdentity (basic)Health (basic)LowContained

IRHYTHM TECHNOLOGIES, INC.

bd_6e810598e0e76931 · schema v1 · pii pii-v2

Severity

Low

Discovered

Jun 8, 2026

Filed

Oct 6, 2026

To disclose

17 weeks

Affected

Not disclosed

Linked

4 filings

Confidence

68%

Full breach record for IRHYTHM TECHNOLOGIES, INC. →

iRhythm Technologies detected unauthorized access to third-party hosted business applications on June 8, 2026. Forensic investigation revealed that unauthorized individuals accessed and downloaded data between June 3 and June 8, 2026. Affected data includes names, contact information, account numbers, device serial numbers, insurance numbers, dates of service, and dates of birth. The company engaged external cybersecurity professionals and implemented its incident response plan.

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California clockDiscovered Jun 8, 2026 → Notified Oct 2, 2026116d ✗ CA 30-day late17 weeks discovery → filing

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

This filing is one of 4 filings about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (3) · sorted by filing gap

Texas State AGbd_0bf13798abef6f352026-10-06Candidate
Oregon State AGbd_ec883df22d677a422026-10-06Verified
HHS OCRbd_e44d9268289dfdc22026-10-03 · +3dCandidate

Name: IRHYTHM TECHNOLOGIES, INC.
norm: irhythm technologies

Name: IRHYTHM TECHNOLOGIES, INC.
norm: irhythm technologies
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: Not disclosed
Data types: Identity (basic)Health (basic)
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1078 Valid AccountsT1041 Exfiltration Over C2 Channel
Threat actor: External
Initial access: supply_chain

During the incident: Implemented our 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 to respond to questions
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: CA 30-day late · 116dCA AG copy ≤15d · 4d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.
Clock breakdown: Statute Window Elapsed Threshold Status
California
Discovered: Jun 8, 2026
→ Notified: Oct 2, 2026
116d 30 calendar days CA 30-day late
California
Consumers notified: Oct 2, 2026
→ AG copy submitted: Oct 6, 2026
4d 15 calendar days CA AG copy ≤15d

Statute	Window	Elapsed	Threshold	Status
California	Discovered: Jun 8, 2026 → Notified: Oct 2, 2026	116d	30 calendar days	CA 30-day late
California	Consumers notified: Oct 2, 2026 → AG copy submitted: Oct 6, 2026	4d	15 calendar days	CA AG copy ≤15d

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 4 filings · 3 states

View merged incident ↗

HHS OCROct 3 · first

Texas State AG+3d

Oregon State AG+3d

California State AG+3d · this page

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://oag.ca.gov/ecrime/databreach/reports/sb24-630879
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: c3551d17126ac3a8a90ece4933f711efc75f249bfa4cff93d90533c501e0490d

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entityIRHYTHM TECHNOLOGIES, INC.

Victim entityIRHYTHM TECHNOLOGIES, INC.

Incidentdiscovered Jun 8, 2026

Stated responseImplemented our incident response plan

ComplianceCA 30-day late

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov