For this months "Patch Tuesday" (September 9th) Microsoft is planning to release 4 critical updates. Being rated "critical" means that the flaws allow remote code execution and is the highest rating Microsoft gives.
The first 2 patch fixes vulnerabilities in Windows Media Player and Encoder.
The third patch covers windows, Internet Explorer, Net. Framework, Office, SQL Server and Visual Studio
The fourth and final patch covers vulnerabilities in Microsoft Office.
September is a quieter month for Microsoft. In contrast August saw 11 patches being issued.