# Medibank Data Breach — medibankclassaction.com.au
# Domain: https://medibankclassaction.com.au
# Generated: 2026-07-30
# Tier: warming

> Medibank is facing a consumer class action in the Federal Court of Australia arising from its major October 2022 cyber incident. The breach affected approximately 9.7 million current and former Medibank, ahm and international student customers, making it one of Australia's largest health data breaches. The information involved included personal information and sensitive health-related information, including names, dates of birth, addresses, phone numbers, email addresses, some Medicare card numbers, some passport numbers and health claims information. Some stolen information was later released on the dark web.

The consumer class action focuses on whether Medibank failed to take reasonable steps to protect customer information and whether affected customers may be entitled to compensation. Slater and Gordon states that it reached an agreement with Baker McKenzie to consolidate their respective class actions against Medibank into a single proceeding. According to Slater and Gordon, the Federal Court approved that consolidation on 1 August 2023, with Baker McKenzie taking responsibility for the consolidated proceeding.

A significant recent development concerns Medibank's attempt to resist production of three Deloitte reports prepared after the cyber incident. In March 2026, reports stated that Medibank was refused leave to appeal a ruling about the Deloitte reports, with the court ordering production of the reports to the applicants in the ongoing consumer class action under a confidentiality regime. Legal commentary has described this as an important privilege issue in cyber incident litigation, particularly where post-incident reports may have operational, regulatory or public relations purposes as well as legal purposes.

Affected Medibank, ahm and international student customers should preserve documents that may help show impact or loss. This includes breach notification emails, Medibank correspondence, scam messages, call logs, screenshots, identity document replacement costs, credit checks, bank or Medicare correspondence, time spent responding to the breach, and any evidence of distress, humiliation, fraud, identity misuse, extortion attempts or financial loss. Because the Medibank incident involved health information, evidence of embarrassment, family safety concerns or harm caused by exposure of sensitive medical information may also be relevant.

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