Abstract. Extensible Component Platforms support the discovery, installation, starting, uninstallation of components at runtime. Since they are often targeted at mobile resource-constraint devices, they have both strong performance and security requirements. The current security model for Java systems, Permissions, are based on call stack analysis. They proves to be very time-consuming, which makes them difficult to use in production environments. We therefore define the Component-Based Access Control (CBAC) Security Model, which aims at emulating Java Permissions through static analysis at the installation phase of the components. CBAC is based on a fully declarative approach, that makes it possible to tag arbitrary methods as sensitive. A formal model is defined to guarantee that a given component have sufficient access rights, and that dependencies between components are taken into account. A first implementation of the model is provided for the OSGi Platform, using the ASM library ...