Dutch medical laboratory Clinical Diagnostics Nederland issued an important notice detailing a security incident involving patient and healthcare worker data [1]. Subsequent reporting by the Dutch public broadcaster and Z-CERT indicated that attackers obtained a large volume of patient data, with the scope of impact later revised upward [2]. Patients should rely on official guidance from the laboratory and Z-CERT and remain vigilant against scams impersonating medical testing or screening services [3].
Backfill: this event became public on Jul 15, 2025 and we added it on Nov 10, 2026. It is not a new event.
HighMonitoringBackfillOfficially confirmed
Clinical Diagnostics Nederland Discloses Unauthorized Access to Patient and Healthcare Worker Data
1 min read
- Disclosed
- Jul 15, 2025
- Published
- Nov 10, 2026
- Last updated
- Nov 7, 2026
- CVSS basis
- Our assessment
- Attack vector
- Actor type
- Motivation
On this page
30-second summary
What happened
Who is affected
Industries mainly affected: Healthcare
What to do nowOur advice
Patients should rely on official guidance from the laboratory and Z-CERT and remain vigilant against scams impersonating medical testing or screening services [3].
Timeline
- Incident publicly disclosed[1]
Technical details
Source-Supported Details
Official notices from Clinical Diagnostics alongside updates from Dutch media and Z-CERT describe a cyberattack on the laboratory's network in which patient and healthcare worker data may have been accessed or copied; the number of affected individuals is subject to the original source text [1].
Source excerpt: "Wat is er gebeurd? Begin juli 2025 is het netwerk van Clinical Diagnostics Nederland getroffen door een gerichte cyberaanval. Hierbij hebben hackers toegang verkregen tot een deel van de IT-omgeving van Clinical Diagnostics NMDL en Clinical Diagnostics LCPL." [1].
Source excerpt: "Bij de cyberaanval op Clinical Diagnostics hebben de aanvallers volgens het laboratorium toegang gekregen tot de gegevens van 850.000 mensen. Dat is nog meer dan de NOS eerder vandaag bekendmaakte." [3].
References
Official / primary1
- [1]
“Wat is er gebeurd? Begin juli 2025 is het netwerk van Clinical Diagnostics Nederland getroffen door een gerichte cyberaanval. Hierbij hebben hackers toegang verkregen tot een deel van de IT-omgeving van Clinical Diagnostics NMDL en Clinical Diagnostics LCPL.”
Media2
- [2]
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