Medibank

Disclosed Oct 13, 20229,700,000 affectedConfirmed

Extortion attack on health insurer exposes data of 9.7 million people

Attackers accessed data on current and former customers of Medibank and its ahm brand, including health claims data, and leaked records on the dark web after Medibank refused to pay a ransom. The OAIC alleges 9.7 million Australians were affected.

What is known

People affected	9,700,000 (as reported by the organization)
Disclosed	Oct 13, 2022
Attack	Ransomware
Data exposed	NamesDates of birthAddressesPhone numbersEmailsGovernment IDsHealthInsurance
Sector	Insurance · AU
Status	Confirmed
Lawsuit or fine	OAIC civil penalty proceedings in the Federal Court (filed 2024)

Sources

Newstechcrunch.com

Medibank breach: Hackers start leaking health data after ransomware attack

Regulatoroaic.gov.au

OAIC takes civil penalty action against Medibank

Newstheguardian.com

Medibank reveals hack could affect all of its 3.9 million customers

Notices filed

TotalOct 13, 2022

Research9,700,000 people

History of this record

Added2026-09-25

First recordedby seedSource

First seen 2026-09-25 (Research), confirmed by Research. Record counts are as reported. Not legal advice.

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