Back to Feed
BreachesOct 23, 2026

Quest Diagnostics Reports Cyber Breach Affecting ‘Certain Patient Records’

Quest Diagnostics reports cyber breach impacting certain patient records via Quanum Lab Services Manager.

Vendor Watch

Run Quest Diagnostics?

Get an email when a reviewed story names Quest Diagnostics, usually within the hour.

Free. Your list stays private and never appears in a subject line. One click stops it. How Vendor Watch worksPrivacy

Summary

Quest Diagnostics has reported a cyber breach involving unauthorized access to its Quanum Lab Services Manager platform. The company discovered the incident on Wednesday and is currently investigating the full scope, including how many patients and which specific records were affected. They are working with external cybersecurity experts and have notified federal law enforcement.

The lesson from this incident

Full lesson

Quest Diagnostics suffered unauthorized access to its Quanum Lab Services Manager platform, a system holding sensitive patient health records. The breach highlights the critical risk of inadequate access controls and monitoring around healthcare platforms that store protected health information (PHI). Unauthorized access to clinical systems can expose highly sensitive data including lab results, demographics, and insurance details — information that fuels identity theft and medical fraud. Healthcare organizations are high-value targets precisely because the data they hold is both sensitive and often inadequately protected behind legacy or third-party platforms.

What helps against this

How we list vendors

Entities

Quanum Lab Services Manager (product)Quest Diagnostics (vendor)