The Dutch land registry database (Kadaster) is at risk of being disrupted by computer hackers, according to internal documents seen by the Financieele Dagblad.

The system’s security is not secure against unauthorised access, meaning outsiders could access and interfere with the information stored by the Kadaster on people’s homes and mortgages.

‘There is a risk that the Kadaster’s services are not secure for customers or information can be obtained or altered by people who should not have access to it,’ said the FD, quoting from internal documents.

The notaries’ organisation KNB said the problems had implications for the whole housing market, because the information in the Kadaster is relied on by other government agencies such as the tax service and municipalities, as well as mortgage lenders.

Nora van Oostrom of the KNB told NOS Radio 1 that lawyers wanted to hold talks with the Kadaster to resolve the situation. ‘I expect the Kadaster to ensure that the details are stored as securely as possible,’ she said.

In a statement the Kadaster acknowledged the problem but said there was no immediate threat to its systems.

‘There is no reason whatsoever at present to doubt the continuity of our business procedures and the security of our information. We have separate systems within our infrastructure,’ it said.