Quest Diagnostics Reports Unauthorized Access to Quanum LSM, Possible Patient Data Exposure
Summary
Quest Diagnostics says unauthorized access to its Quanum LSM system may have exposed patient records. The company stopped the system, paused access to other services as a precaution, and is investigating; data types remain unknown.
Key points
- Quest Diagnostics says it learned of unauthorized access to Quanum LSM on October 21, 2026.
- The company believes some patient records may have been exposed, but has not determined which data types were affected.
- Quest stopped Quanum LSM and temporarily paused access to Essential Insights and LabHQ as a precaution.
- The incident has not disrupted customer-facing operations; direct-customer LIS interfaces and EMRs were not affected, according to the company.
- Quest is investigating with external experts and has notified law enforcement; no threat group was found claiming responsibility.
Article Details
- Victim Organization
- Quest Diagnostics
- Incident Type
- Unauthorized access to the Quanum LSM system; patient records may have been exposed.
- Incident Date
- 2026-10-21
- Data Types Exposed
- Patient records; specific data types are undetermined.
- Operational Impact
- Quanum LSM was stopped, and access to Essential Insights and LabHQ was temporarily paused. Quest Diagnostics said customer-facing operations were not disrupted and direct-customer LIS interfaces and EMRs were not impacted. Customers were advised to use paper requisitions or Quanum eLabs.
- Ransom Or Extortion
- None reported; BleepingComputer could not identify a threat group claiming the attack.
- Claim Status
- confirmed
Products
Essential InsightsAs a cautionary measure, Quest Diagnostics has temporarily paused access to other systems, including Essential Insights and LabHQ.LabHQAs a cautionary measure, Quest Diagnostics has temporarily paused access to other systems, including Essential Insights and LabHQ.Quanum eLabsCurrently, the Quanum LSM system has been stopped, and customers are recommended to use paper requisitions or Quanum eLabs to place orders and receive results.Quanum Lab Services ManagerAmerican clinical laboratory company Quest Diagnostics disclosed that patient records have been exposed after a threat actor gained unauthorized access to its Quanum LSM system.