The statements below are Slater and Gordon’s account of this case. They reflect allegations or the firm’s position and have not been determined by a court unless a settlement or judgment is noted.
Latest update
On 12 December 2025, the Honourable Justice Beach set down the class action for trial, commencing on 7 June 2027. We intend on applying for that to be livestreamed, so that you can watch in real time. We will be sure to post any further information about this on our website closer to the trial. Justice Beach has also ordered all the parties, including the regulators, to attend a mediation by 12 February 2027. This will be the second mediation, after the first mediation in May 2025 which only involved the class action parties, did not result in a settlement. If we successfully reach a settlement at this upcoming mediation, we will send you an email advising you of this outcome if you have signed up to receive updates.
Source: Slater and Gordon
About This Case
On 22 September 2022, Optus announced that a cyberattack had compromised its systems and resulted in unlawful access to the personal information of millions of current and former customers.
Optus advised its customers that the following types of identity documents were disclosed:
Medicare card numbers
Invalid/incomplete ID document numbers (relating to the above listed forms of ID) Approximately 9.5 million former and current Optus customers were affected, including approximately 10,000 customers whose details were exposed on the dark web.
Source: Slater and Gordon
Who May Be Eligible
All former and current Optus customers whose information was compromised in the September 2022 data breach are eligible to participate in the class action. Most affected customers were notified by Optus in the weeks following the data breach that their information had been impacted. If you think that you have not been notified by Optus as your contact details may have changed, we encourage you to request confirmation from Optus.
Source: Slater and Gordon
How to Register
Currently you do not need to take any steps to register in the class action. We recommend you register your interest here so we can tell you when this changes.
Source: Slater and Gordon
Frequently Asked Questions
Is this relevant to me?
This class action is relevant for all former and current customers of Optus whose information was compromised in the data breach. If you are unsure whether your information was compromised, please register your interest so that we can keep you updated and in the future, check whether your information was compromised.
What do I need to do to register in the class action?
Currently you do not need to take any steps to register in the class action. We recommend you register your interest here so we can tell you when this changes.
What happens after I register my interest?
Once you've registered your interest, we will keep you up to date about new developments in the class action. We may contact you at a later stage if there's anything we need from you. We ask that you keep a record of any steps you've taken since becoming aware of the data breach (e.g. changing your phone number or replacing your licence) and how much time you've spent doing that. You do not need to provide us with this information now, but we might ask you for it at a later stage.
I'm concerned about how much information the registration form requests – will my personal information be kept private?
Your personal information will only be used for the purposes of the legal proceeding as required by the Court, or otherwise by law. In all other cases, we will seek your consent before disclosing any of your personal information. We will not disclose any personal information to third parties, including other clients. For more information, see our Privacy Policy.
Another law firm is running an investigation into a possible class action against Optus. Can I register my interest with more than one firm?
Anyone who is a current or former Optus customer can register their interest with Slater and Gordon to receive updates on the class action as it progresses, even if you have already registered your interest with another law firm.
What is a class action?
A class action is a type of legal proceeding in which one person, the lead applicant, brings a claim on behalf of a wider group of people who have all been affected by the same conduct. By grouping claims together and pursuing them collectively, the overall value of the claim makes it economically worthwhile to do so, even if the value of individual claims are modest. Learn more about class actions.
Will I have to devote my time or resources to the legal proceedings?
Initially, we will only require you to provide the information requested in the registration of interest form. At a later stage, we may get in touch with you to request further information.
Are there any risks to me being part of the class action?
You will not be exposed to any out-of-pocket costs or adverse costs orders as a result of your participation or registration of interest.
What can I do if I've been affected?
Those impacted by the incident are advised to contact reputable sources for information. You should not use non-government sites to check if your data has been exposed. Reputable sources include: Office of the Australian Information Commissioner Moneysmart ID Care We otherwise encourage you to have heightened awareness across your accounts, including: Looking out for any suspicious or unexpected activity across your online accounts, including your bank accounts. Make sure to report any fraudulent activity immediately to the related provider. Look out for contact f
Source: Slater and Gordon
Disclaimer: This information is sourced from Slater and Gordon. It is provided for general information only and does not constitute legal advice. Always verify details with the original source before taking any action.
Legal disclaimer: Information on this page is general in nature and does not constitute legal advice. ClaimBar tracks class action settlements and provides updates. Always seek professional legal advice for your specific circumstances.
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