Microsoft Windows Security Bulletins for July report the release of three security patches, all rated "critical". Details of the vulnerabilities these patches pertain to are published in Microsoft's technical summary of July's Security Bulletins.
Users are advised to patch their systems against these vulnerabilities immediately. Patches can be downloaded via links posted within the appropriate Security Bulletin or by visiting Windows Update and Office Update.
Microsoft Security Updates Summary for July
Technical Summary of July's Security Bulletins
The critical patches: