The aim of this paper is to give an overview of security relevant aspects of existing OLAP/Data Warehouse solutions, an area which has seen rather little interest from product developers and is only beginning to be discussed in the research community. Following this description of the current situation, a metadata driven approach implemented as part of the WWW-EIS-DWH project is presented in detail. The prototype focuses on the technical realisation and is intended not to be open for use in different security policies.