AccidentalHealthcareHealthcareMisconfigurationData ExfiltratedCustomer Data InvolvedDelayed DiscoveryPHIHealth (basic)Identity (basic)LowContained

GUARDANT HEALTH, INC.

bd_bf30833a7e61dbb3 · 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

65%

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

Guardant Health, Inc. disclosed that a file containing personal and medical information (names, ages, medical record numbers, treatment info, test results) was inadvertently made publicly accessible on an online platform due to employee error. The file was transferred in October 2020 but discovered on March 4, 2024. Unidentified third parties copied the file between September 8, 2023, and February 28, 2024. No financial information or SSNs were involved. Guardant removed the file, investigated, and enhanced technical controls.

J jump to incidentP pin to compareR raw source

Incident timeline

undetected · 1250 days

discovery → filing · 9 weeks / 60 days

Oct 1, 2020

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

Vermont State AGbd_0cc35de939dca4022024-05-03Verified
Montana State AGbd_667d31d8ec325fca2024-05-03Verified
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: Healthcarellm

Discovered: Mar 4, 2024
Breach occurred: Oct 1, 2020 – Feb 28, 2024
Undetected for: 1,250 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: Not disclosed
Data types: PHIHealth (basic)Identity (basic)
Attack vector: Misconfiguration
MITRE ATT&CK: T1119 Automated Collection
Threat actor: External

During the incident: Promptly removed the file from the online platform
Initiated an investigation
Reviewed available records of activity
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: — (clock not assessable for this source)

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

Vermont State AG+7d

Montana State AG+7d

California State AG+7d · this page

Pattern: first filing Apr 26 (CA), last May 3 (CA) — 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://oag.ca.gov/ecrime/databreach/reports/sb24-584811
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: 43f5cb91fbdd21a7540d1c61b56d77dfced594da55c5c752e7467ea573210bd5

Linked disclosures

Regulatory filings (4) · sorted by filing gap

Reporting entityGUARDANT HEALTH, INC.

Victim entityGUARDANT HEALTH, INC.

Incidentdiscovered Mar 4, 2024

Stated responsePromptly removed the file from the online platform

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov