Risk: High
Microsoft has issued patches for seven critical vulnerabilities in its latest Patch Tuesday. The vulnerabilities have been found in various products, including Word and Excel.
Although all flaws have been classified as critical, two are more severe than others - a flaw in Microsoft Office and a DNS server issue - as they are known to be being currently exploited.
Successful exploitation of all seven flaws can result in remote code execution and patches should be downloaded from Microsoft's security site as a matter of urgency:
http://www.microsoft.com/technet/security/bulletin/ms07-may.mspx