Australia’s Privacy Regulator Sues Optus Over Massive 2022 Data Breach
Australia’s privacy regulator, the Australian Information Commissioner (AIC), has filed a lawsuit against Optus, the Singapore Telecommunications-owned carrier, alleging violations of the Privacy Act 1988 related to a 2022 cyberattack that compromised personal data of nearly 9.5 million customers.
The lawsuit names both Singtel Optus Pty Ltd and Optus Systems Pty Ltd as defendants. The AIC claims a separate breach for each affected customer, with potential fines up to A$2.2 million per breach. However, the regulator has not disclosed the total fine amount sought. Optus is currently reviewing the claims but has not yet assessed the financial impact.
The September 2022 cyberattack is considered one of the worst data breaches in Australia’s history, exposing sensitive information including home addresses, passport details, and phone numbers. Around 10 million Australians—about 40% of the population—were affected, and many experienced a significant disruption to mobile, broadband, and landline services.
The breach sparked calls from Prime Minister Anthony Albanese for stronger privacy laws and faster breach notifications, especially to banks. Optus has also faced ongoing criticism due to a 12-hour nationwide network outage in 2023, leading to the resignation of then-CEO Kelly Bayer Rosmarin.
In addition to this legal action, Optus was taken to court by Australia’s domestic media regulator earlier in 2024 over the same cyberattack.



