INSPECTING ARCHIVED INTELLIGENCE (OUTDATED VERSION).

Quest Diagnostics Lab Service System Compromised by Data Theft Attack

| 2026-10-23 12:52 CRITICAL LOW DATA BREACH
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Executive Summary
AI-generated
On October 23, 2026, Quest Diagnostics reported a data breach impacting more than 2.8 million of its patients and exposing lab results, medical testing information, Social Security numbers, and more after an unauthorized access was discovered in their Quanum Lab Services Manager (LSM) system used to manage medical test results. The company serves half of the doctors and hospitals in the U.S. and one in three American adults each year, with annual revenue exceeding $11 billion. Quest is working with law enforcement to resolve the incident and has paused access to the affected system while investigating what patient data was accessed.
Technical Mitigations AI-generated
• Patch Quanum Lab Services Manager (LSM) to address potential vulnerabilities. • Monitor for signs of unauthorized access, such as unusual login attempts or data modifications. • Implement additional security measures on the affected system, including multi-factor authentication and intrusion detection systems.
Intelligence Metadata
Actors / Malware / CVEs / Campaigns
Target & Sectors
NORTH_AMERICA NORTH_AMERICA healthhealth
Incident Timeline
‎2025/10/23
Threat actors exploited a vulnerability in Quest Diagnostics' lab service system to potentially steal sensitive data.
financial $11 U.S.
Quest is one of the largest clinical laboratory companies in the U.S., reporting more than $11 billion in revenue last year.
‎2026/10/23
Threat actors targeted Quest Diagnostics' lab service system, specifically Quanum Lab Services Manager (LSM), potentially accessing patient data.
organisation Social Security
Baylor Genetics recently admitted that a data breach impacted more than 2.8 million of its patients and exposed lab results, medical testing information, Social Security numbers and more.
organisation Quest Diagnostics
Quest Diagnostics warns of potential data theft after attack on lab service system.
organisation FAQ
The company published a statement and an FAQ about the cyberattack, warning customers that they “believe some patient data” within the system was accessed.
organisation Quanum Lab Services
The platform, Quanum Lab Services Manager (LSM), is used to place test orders as well as receive and look up results.
organisation LSM
The platform, Quanum Lab Services Manager (LSM), is used to place test orders as well as receive and look up results.
organisation Quest
Access to the system has been paused while Quest investigates the attack.
organisation Quantum
Customers can use paper requisitions in place of the system and Quest pledged to have Quantum back up and running by Friday.
organisation PHP
The company noted in the release that the incident did not involve the recent PHP vulnerabilities causing alarm among cybersecurity experts.
organisation Congress
In response to the attacks and several others over the last two years, Congress passed a bill this month expanding federal cyber requirements for healthcare organizations that handle patient data.
Tactical Metrics
Metrics
financial
11,000,000,000
Financial Impact / Stolen Funds
Quest is one of the largest clinical laboratory companies in the U.S., reporting more than $11 billion in revenue last year.
Intelligence Sources
TheRecord 2026-10-23