Information from Six Apart KK

Movable Type 5.02 was released by Six Apart today. It contains fixes for a number of issues including one security vulnerability. It is highly recommended that all users of Movable Type 5.x upgrade their installations, especially the ones with multiple users. Details about the issues that were fixed, and updated versions can be found in this page.

http://www.movabletype.com/blog/2010/05/movable-type-502.html