Microsoft has released its first update to Office 2011, which, in addition to bug fixes, patches a security vulnerability that could allow remote code execution if a user opens or previews a specially crafted RTF e-mail message.

Users can download the 110.5 MB update here, or via the Microsoft AutoUpdate tool. More information about the update is here.
Computerworld points out that the same flaw exists in Microsoft Office 2004 and 2008, and that Microsoft is not offering patches for these versions.