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The John Stewart Company

The John Stewart Company Vendor Cyber Rating & Cyber Score

jsco.net
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A Full Spectrum of Housing Services Under One Roof Whether you're looking for professional property management, construction management services, new project financing, or a joint venture development partner, The John Stewart Company can guide you through the complex process of multi-family real estate financing, development, marketing and management. We have the versatility and professional capacity to perform every task from initial feasibility through development and long-term property management. We serve our customers with 1,000 employees in five offices across California. Our management portfolio contains over 350 properties, more than 20,000 residential units, home to over 65,000 California residents. Our services include:


JSC A.I CyberSecurity Scoring

Incident Details
JSC
Company Information
Website:http://www.jsco.net/
Employees number:865
Number of followers:4,724
NAICS:
Industry Type:Real Estate
Homepage:jsco.net
Cyber Premium EstimationGet Supply Chain
JSC Risk Score (AI oriented)
Between 750 and 799
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JSCReal Estate
Updated:
29/03/2026
756/1000
Fair
Baa
AaaAaABaaBaBCaaCaC
Powered by our proprietary A.I cyber incident model
✖ Insurance prefers TPRM score to calculate premium
JSC Global Score (TPRM)
xxxx
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JSCReal Estate
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Score locked
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Findings

JSC
JSCFair
Current Score
756Baa (FAIR)
01000
1 incidents
0 avg impact
Incident timeline with MITRE ATT&CK tactics, techniques, and mitigations.
AUGUST 2026
757Before Incident
JULY 2026
757Before Incident
JUNE 2026
757Before Incident
MAY 2026
756Before Incident
APRIL 2026
756Before Incident
MARCH 2026
756Before Incident
FEBRUARY 2026
756Before Incident
JANUARY 2026
756Before Incident
DECEMBER 2025
756Before Incident
NOVEMBER 2025
756Before Incident
OCTOBER 2025
756Before Incident
SEPTEMBER 2025
756Before Incident
AUGUST 2012
759Before Incident
Breach
13 Aug 2012 • JSC
The John Stewart Company

Inadvertent Disclosure of Personal Information at John Stewart Company

702After Incident
CRITICAL-57
THE023090625
On August 13, 2012, the John Stewart Company experienced an inadvertent disclosure of personal information, exposing sensitive data of unspecified individuals. The breach involved the compromise of names, Social Security numbers, and birth dates—highly sensitive details that could facilitate identity theft or fraud. The company responded by deleting the affected emails and offering one year of identity theft protection via LifeLock to mitigate potential harm. While the exact number of impacted individuals was not disclosed, the nature of the exposed data (SSNs and birth dates) significantly elevates the risk of long-term financial and reputational damage for those affected. The incident highlights vulnerabilities in data handling practices, particularly in securing personally identifiable information (PII) against unintended exposure.
INCIDENT DETAILS -
TYPE
Data Breach (Inadvertent Disclosure)
MOTIVATION
Unintentional (Human Error)
IMPACT
namessocial security numbersbirth datesBrand Reputation Impact: Potential (due to exposure of sensitive PII)Identity Theft Risk: High (PII exposed)
DATA BREACH
Personally Identifiable Information (PII)Sensitivity Of Data: High (SSNs, birth dates)Emailsnamessocial security numbersbirth dates
REFERENCES
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