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Major Cyber Breach at NSW Health Exposes 100,000 Documents

Major Cyber Breach at NSW Health Exposes 100,000 Documents

First seen 3 Nov 2026, 22:45 UTC • •
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ThreatCluster AI
ThreatCluster •November 4, 2026 at 06:49 UTC
  • •100,000 sensitive documents allegedly stolen from an isolated NSW Health server.
  • •No patient data has been compromised according to Cyber Security NSW.
  • •The investigation is ongoing, led by the NSW Police Cyber Crime Squad.

A hacker claims to have breached an isolated NSW Health server, stealing approximately 100,000 sensitive documents totaling around 70GB. The breach was reported to authorities on October 30, 2026, and has been classified as a major incident. Cyber Security NSW confirmed that no patient data has been compromised, and the investigation is ongoing under Strike Force Civic. The hacker, known as 'bytetobreach', allegedly exploited a misconfigured subdomain to access the data before crashing the server. Authorities are working closely with NSW Police Cyber Crime Squad to investigate the incident. The hacker has made no ransom demands, suggesting motives may include notoriety within hacking communities. The breach is still under investigation, and further details are pending verification.

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Timeline

2026-10-30
Breach reported to authorities
NSW Police Cyber Crime Squad was alerted to a data breach at NSW Health.
Sbs.Au
2026-11-03
Public announcement of breach
NSW Health confirmed the breach and reassured that no patient data was compromised.
Canberratimes.Au
2026-11-04
Ongoing investigation updates
Authorities continue to investigate the breach, confirming no patient data at risk.
Itnews.Au

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Common questions

What type of data was stolen?
The hacker claims to have accessed 100,000 sensitive documents, but specific details on the content are not disclosed.
Is patient data at risk?
No, Cyber Security NSW confirmed that no patient data has been compromised in this breach.
What actions are authorities taking?
NSW Police Cyber Crime Squad is leading the investigation under Strike Force Civic, working closely with NSW Health.