Microsoft has released a Microsoft security advisory KB973472 about this issue for IT professionals about the “vulnerability in Microsoft Office Web Components control could allow remote code execution.” According to company, limited, active attacks have been detected in the wild. In the eventuality of a successful exploit of the Spreadsheet ActiveX control vulnerability, a potential attacker would have similar user rights as the local user.  To have us fix this problem for you, go to the "Fix it for me" section. If you’d rather fix this problem yourself, go to the "Let me fix it myself" section, revealed.