Yesterday morning, the company reached out to some of its Australian users via email, alerting them to what it termed as “suspicious activity.”

“We are notifying you that unauthorized parties may have gained access to certain details related to your reservation,” stated the email.

“Upon detecting unusual activity impacting several reservations, we promptly took steps to address the issue,” the message continued.

Booking.com confirmed to nine.com.au today that they experienced a security breach, mentioning they have implemented measures to control the situation, though they declined to specify how many customers were affected.

A spokesperson for Booking.com assured, “We can confirm that no financial data was accessed from our systems.”

The breached information could encompass booking details, including names, email addresses, phone numbers, and any information shared with the accommodation.

Booking.com has issued new PIN and reservation numbers to customers it believes have been affected by the data breach.

“The security of your personal information is our utmost priority,” the Booking.com email sent to customers said.

“We will continue to enhance and extend the robust security measures we have in place to secure your reservations with us.”

Have you got a story? Contact reporter Lara Pearce at lpearce@nine.com.au

It also advised customers to take extra security precautions, such as installing antivirus software and being vigilant about clicking on any links sent from Booking.com or their accommodation provider.

Booking.com has been contacted for comment.

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