Microsoft released seven security updates Tuesday -- five of them critical -- to fix vulnerabilities in Office, Excel, Windows and Internet Information Services (IIS).
MS06-037 is a critical bulletin that Microsoft recommends IT administrators make the month's top patching priority. It patches eight different flaws in Microsoft Excel, including a zero-day flaw that attackers have already exploited.
The other critical bulletins are:
Microsoft also released two security bulletins it rated as important. They are:
As it does every month, Microsoft also released an updated version of its Windows Malicious Software Removal Tool and will host a webcast Wednesday to address any questions IT administrators have regarding this month's updates.
This article originally appeared on SearchSecurity.com.