Flex and Javascript security implications

I've been research开发者_运维百科ing about Flex and it seems that it's possible to use JavaScript to interact with the Flash component. What I would like to know is if there are any security issues when doing this versus just building everything within the SWF?

Thanks

You have to explicitly define in your Flex code which Javascript functions to respond to.

Look at ExternalInterface.addCallback()

As for Security: there are mechanisms in place to keep things 'secure'.

For local content running in a browser, calls to the ExternalInterface.addCallback() method work only if the SWF file and the containing web page are in the local-trusted security sandbox.

For more info, read through the API