TEXASHackingHealthcareHealthcarePHIHealth (basic)Identity (basic)Medium

LENNOX INTERNATIONAL INC.

bd_f8b82e6708ddfc94 · schema v1 · pii pii-v1

Severity

Medium

Discovered

—

Filed

Apr 17, 2026

To disclose

—

Affected

3,709

Confidence

69%

Full breach record for LENNOX INTERNATIONAL INC. →2 incidents on file

Lennox International Inc. reported to HHS on 2026-04-17 a Hacking/IT Incident affecting 3709 individuals. Breached information located on Network Server. Business Associate present.

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HIPAA clock✓ HHS notified

⚠ no discovery dateNo discovery date was extracted, so no notification clock can be evaluated.

⚠ No discovery dateThe OCR public portal omits the discovery date, so the 60-day notification clock cannot be evaluated from this source — only that the filing was submitted.

Incident timeline — partial

? — ?

Breach window unknown

Apr 17, 2026

Filed

No interval is drawn: no breach start or discovery date is on record for this filing.

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed3,709 affectedView incident

Name: LENNOX INTERNATIONAL INC.
norm: lennox international
Industry: Insurance — Health

Name: LENNOX INTERNATIONAL INC.
norm: lennox international
Industry: Healthcaresource default

Discovered: Not extracted — the OCR public portal omits it
Materiality determined: —
Notification sent: —
Affected individuals: 3,709nationwide
Data types: PHIHealth (basic)Identity (basic)
HHS breach type: Hacking / IT incident
Where the data lived: Network server
Covered-entity type: Health planBusiness associate involved
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing Application
Threat actor: External
Regulator citations: Notified HHS

Compliance flags: HHS notified
Discovery-date grounding: no discovery dateNo discovery date was extracted, so no notification clock can be evaluated.
Clock breakdown: Statute Window Elapsed Threshold Status
HIPAA
Discovered: not extracted
→ Notified: not extracted
— regulatory submission HHS notified

Statute	Window	Elapsed	Threshold	Status
HIPAA	Discovered: not extracted → Notified: not extracted	—	regulatory submission	HHS notified

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://ocrportal.hhs.gov/ocr/breach/breach_report.jsf
DisclosureLens renders the full SEC/HHS filing inline below from the originating regulator’s public record (§4.5 fair report privilege).
Filed at: Apr 17, 2026
Raw hash: 01f16ccfdf3661c4925a1be5d5c57fdfa3c3464e705cb4eefe30127b2cd48e39

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Reporting entityLENNOX INTERNATIONAL INC.

Victim entityLENNOX INTERNATIONAL INC.

IncidentUnauthorized Access

ComplianceHHS notified

Extraction provenanceno artifact recorded

Source provenanceocrportal.hhs.gov

Source filing