Microsoft has pushed out a cumulative security update today for Internet Explorer on Windows 10 build 10049.
The company has also pushed out an update to the Windows Server Technical Preview and Hyper-V Server Technical Preview that extends the build's expiration date until the next preview is available in May.
Microsoft says that the Internet Explorer cumulative security update on Windows 10 build 10049 addresses the following:
This security update resolves vulnerabilities in Internet Explorer. The most severe of the vulnerabilities could allow remote code execution if a user views a specially crafted webpage using Internet Explorer. An attacker who successfully exploited these vulnerabilities could gain the same user rights as the current user. Customers whose accounts are configured to have fewer user rights on the system could be less impacted than those who operate with administrative user rights.
The Windows Server and Hyper-V Server Technical Preview update is rather self explanatory, with Microsoft saying the following:
This article describes an update that will allow you to continue using the Windows Server Technical Preview and Hyper-V Server Technical Preview from October 2014 without interruption until the next preview is available in May 2015.
As usual, you should be able to snag both updates through Windows Update now.