Update README.md

Author: HollyAM

releases/UWP/net-native1.4/README.md

@@ -4,6 +4,9 @@ You can see what was included in each .NET Native 1.4 ([Microsoft.NETCore.Univer
 
 When using Visual Studio these packages require Visual Studio 2015 Update 3 or later.
 
+### 5.2.6 (July 27th, 2018)
+- Fixed CVE-2018-8356: Security Feature Bypass in X509 Certificate Validation: https://github.com/dotnet/announcements/issues/73
+
 ### 5.2.4 (January 9th, 2018)
 - Fixed CVE-2018-0786: Security Feature Bypass in X509 Certificate Validation: https://github.com/Microsoft/dotnet/issues/597