All current users are told to immediately change their passwords, and change passwords for other services if using the same email and password combination.
Says the company (via Mash):
The Trapster team has recently learned that our website has been the target of a hacking attempt, and it is possible that your email address and password were compromised.
We have taken, and continue to take, preventative measures to avoid future incidents, but we are recommending that you change your Trapster password.
It was unclear how the breach happened and what the app has done to improve security.
Written by: Andre Yoskowitz @ 22 Jan 2011 1:00