Permissive crossdomain.xml policy files allow external Adobe Flash (SWF) scripts to interact with your website.
Depending on how authorization is restricted on your website, this could inadvertently expose data to other domains or allow invocation of functionality across domains. The cross-domain policy file should permit only domains that can be trusted to make requests that include the user's domain-specific cookies.
See Cross-domain policy file usage recommendations for Flash Player
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