Another Australian company has fallen victim to a cybersecurity breach, with more than 1,600 customers of telco providers Dodo and iPrimus affected.

The incident, which took place on Friday, was confirmed the following day by Vocus, the parent company of both Dodo and iPrimus.

“Our initial investigation has revealed unauthorised access to around 1,600 Dodo email accounts, resulting in unauthorised SIM swaps on 34 Dodo Mobile accounts,” a Vocus spokesperson said.

The company stated that it had worked with affected customers to reverse the SIM swaps and continues to closely monitor the situation. Email services were temporarily suspended as a precaution but were restored on Sunday morning.

A network monitoring website showed a spike in customer outage reports on Saturday, with about 30 complaints lodged by midday.

Vocus said it has been updating customers through its website and social media channels and will offer additional support through IDCare. Authorities have also been notified of the breach.

Dodo and iPrimus together account for 9.2% of Australia’s NBN market, with around 804,000 customers nationwide, making them the country’s fourth-largest provider.

The breach follows a series of recent cybersecurity incidents involving major Australian companies. Last week, Qantas confirmed that data belonging to up to 5.7 million customers had been leaked on the dark web. In August, telco iiNet reported that data from approximately 280,000 customers may have been stolen after a system breach.

Meanwhile, Optus continues to face fallout from its catastrophic triple-zero outage, which has been linked to three deaths and has driven millions of customers to consider leaving the telco.