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Quest Diagnostics confirms patient information accessed in cyberattack, systems temporarily shut down t.co/exvlCOF4u1
Quest Diagnostics
Security incidents tagged Quest Diagnostics. Newest first.
1 Quest Diagnostics incident in the last 12 months
Critical 4 · High 3 · Med 2 · Low 1 · Update ½Severity-weighted: critical 4 · high 3 · medium 2 · low 1 · update ½LessMore
- Incidents
- 1
- Live
- 1
- Patched
- 0
- Days without an incident
- 0
- Longest quiet run: 1 day (Oct 23–Oct 23)
- HighPartly patched
Quest Diagnostics breach: patient records accessed via Quanum Lab Services Manager
Quest Diagnostics says it learned on Oct 21 2026 of unauthorized access to its Quanum Lab Services Manager (LSM), the system some clients use to place lab test orders and receive and look up results. Quest believes some patient data in Quanum LSM was accessed and confirms PHI/PII was involved; the specific data affected is still being investigated. Quest paused access to Quanum LSM (and, as a precaution, Essential Insights and LabHQ, where no data was accessed), notified federal law enforcement and engaged outside experts. Core operations are not materially disrupted, and Quest says the incident is not related to the PHP vulnerabilities.
Quest Diagnostics Quanum Lab Services Manager (lab ordering and results portal)Since Oct 21, 2026
Posts 2
- Quest Diagnostics breach: patient records accessed via Quanum Lab Services Manager
- Quest Diagnostics breach: patient records accessed via Quanum Lab Services Manager
Reuters Legal@ReutersLegalQuest Diagnostics on Thursday said it learned of unauthorized access to its Quanum LSM system, which some clients use to place test orders, receive and look up results. t.co/tvqxrMZHmo
