“Some personal information of our customers (such as name, address, email address or phone number) and booking information has or may have been accessed,” Bookeasy said. “Importantly, based on the status of our ongoing investigation, we have currently not identified any access to credit card details.”

However, it warned that the nature of these incidents may mean that gaining certainty over what was accessed is not always possible.

“We want to be transparent with all our partners about what we know and provide information to support your customers,” the company said.

Any customer who receives an unexpected email, text message or phone call asking them to confirm or provide personal information, should not respond, click on any links, or provide any personal information.

Bookeasy says it was confident that its containment efforts had resolved the issue and says it has been working with an external third-party expert to validate those efforts.

Nonetheless, Queensland Parks and Wildlife Service (QPWS) still has its booking system closed. It says though that the state’s national parks, state forests and recreation areas remain open, and temporary arrangements are in place to minimise disruption to visitors.

While the booking system is unavailable, visitors can camp in parks that are open, without a camping permit. They can also access K’gari, Cooloola and Bribie Island recreation areas without a vehicle access permit.

The QPWS says all existing bookings and permits remain valid, but changes and cancellations cannot currently be processed.

“Visitors will not be penalised for not holding a camping or vehicle access permit while temporary arrangements are in place,” it said.

A departmental spokesperson thanked visitors for their patience and understanding while the booking system was unavailable.

“We’re working to securely reactivate bookings as soon as possible and encourage visitors planning future trips to check our website for updates,” they said. “We appreciate everyone’s patience while these temporary arrangements are in place.”

Parks Victoria says it has also temporarily deactivated its booking system.

It says all existing bookings remain valid, but it cannot make any changes or cancellations at this time.

“Bookings are only required at 131 of our many campsites,” Parks Victoria said in its website. “There are hundreds of free Parks Victoria campsites across the state that don’t need a booking, from the banks of the Murray River to the high country of the Alpine National Park … non-bookable sites are available on a first come, first served basis.”

South Australia’s National Parks and Wildlife Service says Bookeasy was investigating the cyber security incident.

“Customers are encouraged to remain vigilant for suspicious communications and read the latest updates,” it said.

This incident comes just a week after a security breach at Australian booking management software provider RMS Cloud, which provides cloud-based property management and booking systems to more than 6,000 hotels, holiday parks and serviced apartments around the world.

Major holiday park operators, including Reflections, BIG4 and G’day Parks, were understood to be among those who have been affected by the RMS breach.

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