Turn off cross-document messaging

Supported on: At least Internet Explorer 8.0

Registry

HKLM Software\Policies\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_CROSS_DOCUMENT_MESSAGING

HKCU Software\Policies\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_CROSS_DOCUMENT_MESSAGING

Value name: iexplore.exe

Enabled: iexplore.exe = 0

Disabled: iexplore.exe = 1

Description

This policy setting allows you to manage whether documents can request data across third-party domains embedded in the page. If you enable this policy setting, documents cannot request data across third-party domains embedded in the page. If you disable or do not configure this policy setting, documents can request data across third-party domains embedded in the page.