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The attack vector for the mitigation bypass was safe-scriptable COM objects. As COM is a general technology, not limited to safe-scripted environments such as Internet Explorer, there are many unsafe objects which could be abused if they were allowed to be created. To prevent this, hosts, such as Internet Explorer, use two mechanisms to determine whether an object is safe for being used in the host environment, Category IDs and the IObjectSafety interface. The Category IDs, CATID_SafeForScripting and CATID_SafeForInitializing can be added to a COM object registration to indicate to a COM host that the object is safe for either scripting or initialisation. These are static indicators, and are not particularly of interest.

A: I thought the house of God was open to all people at all times. 
B: It is. But God is not at home right now. He is down the road at the orphanage.