An update has been released (or re-released) that fixes an issue described in Microsoft Security Advisory 2871690. The fix, targeted for Windows 8 and , patches an issue where non-compliant third-party modules could load prior to the UEFI Secure Boot process.
Per the Advisory, the re-release…
…addresses an issue where specific third-party BIOS versions did not properly validate the signature of the original update.
Here's the downloads for the updates: