TPG-owned internet provider iiNet has been the victim of a data breach that has exposed the personal data of as many as 280,000 customers.
In a statement, the provider said that it was "impacted by an incident involving unauthorised access to its order management system by an unknown third party."
At the time of writing, iiNet believes that this unknown party managed to obtain the email addresses of over 280,000 active customers, the landline numbers of 20,000 customers and 1700 modem setup passwords.
Another 10,000 usernames, street addresses and phone numbers were also accessed, as well as an undisclosed number of inactive email addresses and numbers.
iiNet said that early investigations named the stolen credentials of an employee as a likely attack vector and insisted that no credit, banking or financial information had been compromised.
TPG Telecom chief executive officer Inaki Berroeta also issued a formal apology to iiNet customers and pledged to share more information about the cyber incident as it became available.