Thousands of flood victims who applied for a government buyback scheme have had their personal information put into AI program ChatGPT in a major data breach.

Home owners in the Lismore and Northern Rivers areas of NSW had names, email addresses, phone numbers and personal health information put into the website by a contractor tasked with assessing buyback applications.

The data shared was a Microsoft Excel spreadsheet with 10 columns and more than 12,000 rows of information.

The NSW Reconstruction Authority said an investigation into the breach found no evidence that personal information had been accessed by a third party or been made publicly available.

But the authority admitted it "cannot be ruled out" until an investigation by Cyber Security NSW was complete.

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