A data leak at land registry office Kadaster has exposed secret home addresses for weeks, potentially putting people at risk.

The leak, which the Kadaster said was a result of a systems update, left the addresses for anyone to see between September 18 and October 11, the Volkskrant found, based on correspondence between the registry office and some of the people affected.

The Kadaster has strict criteria in place to make addresses inaccessible. Since 2019 the addresses of people who are on a list drawn up by national terrorism coordinator NCTV or who are under police protection are not in the public domain, including those belonging to all members of the cabinet.

In May 2018 the Kadaster included some 218 secret addresses out of a total of four million home addresses, the paper said.

It is not clear how many people were duped in the incident, which has been reported to privacy watchdog Autoriteit Persoonsgegevens (AP).

The leak is one of a series of security breaches which show citzens and companies are ‘unaware of the risks of data storage’,  the paper said.

In October data from MPs entry cards was hacked and put online after criminals broke into software company ID-ware, but that information did not include home addresses.