The Microsoft.Build nuget package, which is a dependency of EpicGames.MsBuild, has a newly reported vulnerability https://github.com/advisories/GHSA\-w3q9\-fxm7\-j8fq
There is a new patch version that fixes it, which is 17.11.48. Created a PR for it here https://github.com/EpicGames/UnrealEngine/pull/13931