Along with the KB3156421 cumulative update that brings Windows 10 Build 10586.318 for Version 1511 (Build 10586.218), Microsoft has also released KB3156387 to Version 1507 that brings Windows 10 Build 10240.16854 to those on Build 10240.16771. Check below for the full changelog of cumulative update KB3156387.
KB3156387 (Windows 10 Build 10240.16854 ) Changelog:
This update includes quality improvements and security fixes. No new operating system features are being introduced in this update. Key changes include:
Fixed memory leak that occurs when opening a portable document format (PDF) form multiple times.
Fixed issues with text alignment for right to left languages in Internet Explorer 11 and Microsoft Edge.
Fixed issue that caused sign in to temporarily fail after a password change.
Fixed issue that sometimes corrupts CompactFlash cards inserted into a card reader.
Fixed issue with losing network connectivity intermittently when roaming between Wi‑Fi access points.
Improved security in the Windows kernel.
Fixed issue with revised daylight saving time.
Fixed additional issues with Internet Explorer 11.
Updated security for kernel mode drivers.
Fixed additional security issues with the Microsoft Graphics Component, remote procedure calls, Internet Explorer 11, Microsoft Edge, Windows Journal, JScript, Schannel, Windows Shell, and Virtual Secure Mode.