From https://github.com/dotnet/source-build/discussions/3481

--- a/src/nuget-client/build/common.project.props
+++ a/src/nuget-client/build/common.project.props
@@ -14,7 +14,7 @@
     <NETFXTargetFrameworkVersion>v4.7.2</NETFXTargetFrameworkVersion>
     <NETFXTargetFramework>net472</NETFXTargetFramework>
     <NETCoreTargetFramework>netcoreapp3.1</NETCoreTargetFramework>
-    <NETCoreTargetFramework Condition="'$(DotNetBuildFromSource)' == 'true'">net7.0</NETCoreTargetFramework>
+    <NETCoreTargetFramework Condition="'$(DotNetBuildFromSource)' == 'true'">net8.0</NETCoreTargetFramework>
     <NETCoreTestTargetFrameworks>net7.0;net8.0</NETCoreTestTargetFrameworks>
     <NetStandardVersion>netstandard2.0</NetStandardVersion>
     <TargetFrameworksExe>$(NETFXTargetFramework);$(NETCoreTargetFramework)</TargetFrameworksExe>
@@ -24,7 +24,7 @@
     <TargetFrameworksExeForSigning Condition="'$(DotNetBuildFromSource)' == 'true'">$(TargetFrameworksExe);net7.0</TargetFrameworksExeForSigning>
     <MinimalTargetFrameworksExeSigning>$(NETFXTargetFramework);netcoreapp5.0</MinimalTargetFrameworksExeSigning>
     <MinimalTargetFrameworksExeSigning Condition=" '$(IsXPlat)' == 'true' ">netcoreapp5.0</MinimalTargetFrameworksExeSigning>
-    <MinimalTargetFrameworksExeSigning Condition="'$(DotNetBuildFromSource)' == 'true'">net7.0</MinimalTargetFrameworksExeSigning>
+    <MinimalTargetFrameworksExeSigning Condition="'$(DotNetBuildFromSource)' == 'true'">net8.0</MinimalTargetFrameworksExeSigning>
     <TargetFrameworksLibrary>$(NETFXTargetFramework);$(NetStandardVersion)</TargetFrameworksLibrary>
     <TargetFrameworksLibrary Condition="'$(DotNetBuildFromSource)' == 'true'">$(NETCoreTargetFramework);$(NetStandardVersion)</TargetFrameworksLibrary>
     <TargetFrameworksLibraryForSigning>$(TargetFrameworksLibrary);netcoreapp5.0</TargetFrameworksLibraryForSigning>
--- a/src/nuget-client/build/common.targets
+++ b/src/nuget-client/build/common.targets
@@ -6,7 +6,7 @@
     <IsDesktop>true</IsDesktop>
   </PropertyGroup>
 
-  <PropertyGroup Condition=" $(TargetFramework.StartsWith('netcoreapp')) OR $(TargetFramework.StartsWith('netstandard')) OR $(TargetFramework.StartsWith('net6')) OR $(TargetFramework.StartsWith('net7')) ">
+  <PropertyGroup Condition=" $(TargetFramework.StartsWith('netcoreapp')) OR $(TargetFramework.StartsWith('netstandard')) OR $(TargetFramework.StartsWith('net6')) OR $(TargetFramework.StartsWith('net7')) OR $(TargetFramework.StartsWith('net8')) ">
     <DefineConstants>$(DefineConstants);IS_CORECLR</DefineConstants>
     <IsCore>true</IsCore>
   </PropertyGroup>
--- a/src/nuget-client/src/NuGet.Core/NuGet.Configuration/NuGet.Configuration.csproj
+++ a/src/nuget-client/src/NuGet.Core/NuGet.Configuration/NuGet.Configuration.csproj
@@ -26,7 +26,7 @@
     <Reference Include="System.Xml.Linq" />
   </ItemGroup>
 
-  <ItemGroup Condition=" '$(TargetFramework)' == '$(NetStandardVersion)' or '$(TargetFramework)' == 'net7.0' ">
+  <ItemGroup Condition=" '$(TargetFramework)' == '$(NetStandardVersion)' or '$(TargetFramework)' == 'net7.0' or '$(TargetFramework)' == 'net8.0' ">
     <PackageReference Include="System.Security.Cryptography.ProtectedData" />
   </ItemGroup>
 
--- a/src/nuget-client/src/NuGet.Core/NuGet.PackageManagement/NuGet.PackageManagement.csproj
+++ b/src/nuget-client/src/NuGet.Core/NuGet.PackageManagement/NuGet.PackageManagement.csproj
@@ -32,7 +32,7 @@
     <Reference Include="System.Net.Http" />
   </ItemGroup>
 
-  <ItemGroup Condition=" '$(TargetFramework)' == '$(NetStandardVersion)' or '$(TargetFramework)' == 'net7.0' ">
+  <ItemGroup Condition=" '$(TargetFramework)' == '$(NetStandardVersion)' or '$(TargetFramework)' == 'net7.0' or '$(TargetFramework)' == 'net8.0' ">
     <PackageReference Include="System.ComponentModel.Composition" />
   </ItemGroup>