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<?xml version="1.0"?>
<!DOCTYPE cross-domain-policy SYSTEM "">
<!-- Read this: -->
<!-- Most restrictive policy: -->
<site-control permitted-cross-domain-policies="none"/>
<!-- Least restrictive policy: -->
<site-control permitted-cross-domain-policies="all"/>
<allow-access-from domain="*" to-ports="*" secure="false"/>
<allow-http-request-headers-from domain="*" headers="*" secure="false"/>
If you host a crossdomain.xml file with allow-access-from domain="*"
and don’t understand all of the points described here, you probably
have a nasty security vulnerability. ~ simon willison