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John Muir Health

John Muir Health Vendor Cyber Rating & Cyber Score

johnmuirhealth.com
in
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ISO 27001
SOC 2 Type 1
SOC 2 Type 2
PCI DSS
HIPAA
GDPR

John Muir Health is a nationally recognized, not-for-profit health care organization east of San Francisco serving patients in Contra Costa, Alameda and southern Solano Counties. It includes a network of more than 1,000 primary care and specialty physicians, more than 6,000 employees, medical centers in Concord and Walnut Creek, including Contra Costa County’s only trauma center, and a Behavioral Health Center. John Muir Health also has partnerships with UCSF Health, Tenet Healthcare/San Ramon Regional Medical Center and Stanford Children's Health. The health system offers a full-range of medical services, including primary care, outpatient and imaging services, and is widely recognized as a leader in many specialties – neurosciences,


JMH A.I CyberSecurity Scoring

Incident Details
JMH
Company Information
Website:https://www.johnmuirhealth.com
Employees number:4,132
Number of followers:32,703
NAICS:62
Industry Type:Hospitals and Health Care
Homepage:johnmuirhealth.com
Cyber Premium EstimationGet Supply Chain
JMH Risk Score (AI oriented)
Between 700 and 749
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JMHHospitals and Health Care
Updated:
29/03/2026
746/1000
Moderate
Ba
AaaAaABaaBaBCaaCaC
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JMH Global Score (TPRM)
xxxx
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JMHHospitals and Health Care
•••
Score locked
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Findings

JMH
JMHModerate
Current Score
746Ba (MODERATE)
01000
2 incidents
0 avg impact
Incident timeline with MITRE ATT&CK tactics, techniques, and mitigations.
JULY 2026
747Before Incident
JUNE 2026
747Before Incident
MAY 2026
746Before Incident
APRIL 2026
746Before Incident
MARCH 2026
746Before Incident
FEBRUARY 2026
745Before Incident
JANUARY 2026
745Before Incident
DECEMBER 2025
744Before Incident
NOVEMBER 2025
744Before Incident
OCTOBER 2025
744Before Incident
SEPTEMBER 2025
743Before Incident
AUGUST 2025
743Before Incident
JULY 2021
767Before Incident
Breach
01 Jul 2021 • JMH
John Muir Health

John Muir Health - Walnut Creek Medical Center Data Breach (2021-2023)

706After Incident
CRITICAL-61
JOH556091725
The California Office of the Attorney General disclosed on April 13, 2023, that John Muir Health - Walnut Creek Medical Center suffered a data breach due to an internal error. A staff member created a website that inadvertently included an external link to an Excel file containing identifiable patient health information. The exposed file was published on July 1, 2021, but remained accessible until its decommissioning on March 24, 2023. The breach involved the potential unauthorized disclosure of sensitive patient data, though the exact number of affected individuals remains undetermined. The incident highlights risks associated with improper data handling and unintended public exposure of protected health records, raising concerns over patient privacy, regulatory compliance (e.g., HIPAA), and trust in the healthcare provider. The breach was not attributed to malicious cyber activity but rather human error and inadequate safeguards in publishing internal documents.
INCIDENT DETAILS -
TYPE
Data Breach (Inadvertent Disclosure)
IMPACT
Brand Reputation Impact: Potential (Patient Trust Erosion)Legal Liabilities: Potential (HIPAA Violation)Identity Theft Risk: Potential (PII Exposure)
DATA BREACH
Patient Health Information (PHI)Personally Identifiable Information (PII)Number Of Records Exposed: UnknownSensitivity Of Data: High (Health + PII)Data Exfiltration: Unintentional (Publicly Accessible)Excel (.xls/.xlsx)
REFERENCES
Blog URLSource URL
APRIL 2010
772Before Incident
Breach
01 Apr 2010 • JMH
John Muir Health

John Muir Health Data Breach

699After Incident
CRITICAL-73
JOH13312822
John Muir Health, the Walnut Creek-based hospital system suffered a data breach incident that affected 5,450 patients after two of its office laptops were stolen. The stolen laptops contained the personal and health information of its patients. John Muir launched the investigation and started notifying the affected patients.
INCIDENT DETAILS -
TYPE
Data Breach
IMPACT
Personal InformationHealth InformationLaptops
DATA BREACH
Personal InformationHealth Information
REFERENCES
Blog URLSource URL

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