Internet auction site Trade Me has become the target of an email scam.
Members were sent an email asking them to update their details including passwords on a website which looked like an official Trade Me site.
The scam was traced to South Korea and the bogus site is being closed down.
Trade Me's Mike O'Donnell says the scammers were most likely hoping to gain financially by logging on to the site under somebody else's name.
This would allow them to hold fake auctions and receive money under false pretences.
All 75 members who gave details to the scammers have been told to change their details.
O'Donnell says there's no truth to rumours on a blog that the scam was an extortion attempt on Trade Me.
An internet watchdog is accusing Trade Me of trying to underplay problems with scams.
Trade Me initially said this was the first case of its kind this year but later admitted to a similar thing happening on five different occasions in the past three months.
Alf West of watchdog group Scambusters says he would like to see Trade Men site get serious about security and make it compulsory for members to verify their home address.
West says as long as Trade Me maintains its the safest site in New Zealand people will continue to get ripped off.
Trade Me says it does take security seriously with five arrests last year for internet fraud on its site.