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Quest Diagnostics Reports Cyber Breach of Patient Records

Quest Diagnostics Reports Cyber Breach of Patient Records

First seen 22 Oct 2026, 17:13 UTC • •
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ThreatCluster AI
ThreatCluster •October 22, 2026 at 18:14 UTC
  • •Unauthorized access to patient records at Quest Diagnostics confirmed.
  • •Incident reported in SEC filing on October 22, 2026, with breach discovered on October 21.
  • •No material disruption to business operations reported; investigation ongoing.

Quest Diagnostics reported unauthorized access to its Quanum Lab Services Manager system, affecting patient records. The company disclosed the incident in an SEC filing on October 22, 2026, noting that it learned of the breach on October 21. While the full scope of the breach is under investigation, Quest believes certain patient records were accessed. The company has notified federal law enforcement and initiated cybersecurity incident response procedures. There has been no material disruption to its business operations. The breach coincides with a wave of cyberattacks on the healthcare sector, although it is unclear if it relates to recently discovered vulnerabilities in the PHP programming language. Quest Diagnostics has not confirmed how the intrusion was discovered or if it is linked to the PHP vulnerabilities. The company is working with law enforcement to investigate the incident.

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Timeline

2026-10-21
Unauthorized access discovered
Quest Diagnostics learned of unauthorized access to its systems affecting patient records.
Insurancejournal
2026-10-22
Incident disclosed in SEC filing
Quest Diagnostics filed with the SEC, detailing the unauthorized access and notifying federal law enforcement.
Gizmodo

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Extracted Entities (7)

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Common questions

What patient data was compromised?
The specific details of the patient records accessed have not been disclosed by Quest Diagnostics.
How is Quest responding to the breach?
Quest has initiated cybersecurity incident response procedures and is cooperating with federal law enforcement.
Is there a risk of further exploitation?
The articles do not confirm any ongoing exploitation related to this breach, but the investigation is ongoing.