The software giant also will issue an update for the Windows Malicious Software Removal Tool (MSRT), according to a notification bulletin released this afternoon.
Of the three security updates, two address "important" flaws in Windows, while the Office bug is deemed "critical."
The flaw, reported in Microsoft Word 2000 when running on Windows 2000, is caused by an unspecified error that occurs when a computer processes Word documents, according to vulnerability monitoring firm Secunia. The vulnerability is exploited when a malicious document is opened, dropping a trojan and allowing the intruders to remotely execute arbitrary code and compromise a user's PC.
Last month, Microsoft issued 12 patches, among the second-highest total ever.