Billionaire Clive Palmer has “sincerely apologised” after his political parties were hacked, exposing bank details and identity records of thousands of supporters.

The United Australia Party and Trumpet of Patriots, both funded by Mr Palmer, noticed unauthorised access to their servers, resulting in the “exfiltration” of data records on June 23.

“We were the subject of a ransomware cyber-attack,” the parties said in a statement.

Personal information such as email addresses, phone numbers, identity records, banking details, employment history, documents provided under confidentiality arrangements and “the like” have been exposed.

“We do not know comprehensively what information of yours was on the server but you should assume that any information you have provided would have been stored on the server,” the parties said.

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