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NSW Health Cyber Breach: 100,000 Documents Compromised

NSW Health Cyber Breach: 100,000 Documents Compromised

First seen 3 Nov 2026, 22:45 UTC • •
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ThreatCluster AI
ThreatCluster •November 4, 2026 at 00:46 UTC
  • •100,000 documents allegedly stolen from an isolated NSW Health server.
  • •No patient data has been compromised according to authorities.
  • •The incident is under investigation by the NSW Police Cybercrime Squad.

A cyber breach at NSW Health has resulted in the alleged theft of 100,000 sensitive documents from an isolated server. The incident was reported to the NSW Police Cybercrime Squad on October 30, 2026, and has been declared a major incident. Authorities confirmed that no patient data was compromised during the breach. The hacker, identified as 'bytetobreach', claimed to have exploited a misconfigured subdomain, exfiltrating approximately 70GB of data. The breach is currently under investigation by the police, and Cyber Security NSW is involved in the response. Health Minister Ryan Park emphasized the need for continuous improvement in cybersecurity measures. The investigation is ongoing, and updates will be provided as they become available.

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Timeline

2026-10-30
Breach reported to police
NSW Police Cybercrime Squad was alerted to the breach at 1pm, marking the start of an investigation.
Sbs.Au
2026-11-03
Public announcement of breach
NSW Health confirmed the breach and stated that no patient data was compromised, declaring it a major incident.
News.Au

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Common questions

What type of data was stolen?
The breach involved approximately 100,000 sensitive documents, but no patient data was compromised.
How did the breach occur?
The hacker claimed to have exploited a misconfigured subdomain to access the documents.
What actions are being taken in response?
The NSW Police Cybercrime Squad is investigating the breach, and Cyber Security NSW is involved in the response efforts.