MisuseHealthcareTechnologyHealthcareData MishandlingDelayed DiscoveryData ExfiltratedIdentity (basic)Health (basic)PHILowContained

GUARDANT HEALTH, INC.

bd_0cc35de939dca402 · schema v1 · pii pii-v1

Severity

Low

Discovered

Mar 4, 2024

Filed

May 3, 2024

To disclose

9 weeks

Affected

Not disclosed

Linked

5 filings

Confidence

66%

Full breach record for GUARDANT HEALTH, INC. →4 incidents on file

Guardant Health, Inc. notified Vermont AG that an employee inadvertently made a file containing patient personal and medical information publicly accessible in October 2020. Unidentified third parties copied the file between September 2023 and February 2024. Data included names, ages, medical record numbers, and test results; no SSNs or financial data were involved.

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Vermont clock⏱ VT AG >14 bday9 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 · 178 days

discovery → filing · 9 weeks / 60 days

Sep 8, 2023

Begins

Mar 4, 2024

Discovered

May 3, 2024

Filed

vs. sector median

4 wks faster

This filing is one of 5 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (4) · sorted by filing gap

Montana State AGbd_667d31d8ec325fca2024-05-03Verified
California State AGbd_bf30833a7e61dbb32024-05-03Verified
Illinois State AGbd_3c733c8d7ae6714d2024-05-01 · +2dVerified
HHS OCRbd_dc3c65f1e089173f2024-04-26 · +7dVerified

Name: GUARDANT HEALTH, INC.
norm: guardant health
Domain: guardanthealth.com

Name: GUARDANT HEALTH, INC.
norm: guardant health
Domain: guardanthealth.com
Industry: HealthcarellmTechnologyllm

Discovered: Mar 4, 2024
Breach occurred: Sep 8, 2023 – Feb 28, 2024
Undetected for: 178 daysoccurrence → discovery
Materiality determined: —
Notification sent: May 3, 2024
Affected individuals: Not disclosed
Data types: Identity (basic)Health (basic)PHI
Attack vector: Insider
MITRE ATT&CK: T1078 Valid AccountsT1119 Automated Collection
Threat actor: Internal
Initial access: insider_action

During the incident: Removed the file from the online platform
Initiated an investigation
Enhanced technical controls in systems that contain patient information
Continue to educate our workforce regarding the handling of sensitive information
Changes made: Enhanced technical controls in systems that contain patient information
Continue to educate our workforce regarding the handling of sensitive information
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 9 weeks(60 days from discovery to filing)
Compliance flags: VT AG >14 bday
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.

Filing propagation · 5 filings · 4 states

View merged incident ↗

HHS OCRApr 26 · first

Illinois State AG+5d

Montana State AG+7d

California State AG+7d

Vermont State AG+7d · this page

Pattern: first filing Apr 26 (CA), last May 3 (VT) — a 7-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

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://ago.vermont.gov/document/2024-05-03-guardant-health-data-breach-notice-consumers
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: May 3, 2024
Raw hash: 4a812355b79aaec2c6a8d6589f56be89a3929a52c8d000bb39e2f4f323164885

Linked disclosures

Regulatory filings (4) · sorted by filing gap

Reporting entityGUARDANT HEALTH, INC.

Victim entityGUARDANT HEALTH, INC.

Incidentdiscovered Mar 4, 2024

Stated responseRemoved the file from the online platform

ComplianceVT AG >14 bday

Extraction provenanceno artifact recorded

Source provenanceago.vermont.gov