Is Constrained Language mode enabled in Powershell by default? in latest Windows 10 FCU build, up-to-date


You can also control this via __PSLockdownPolicy env variable. A value of 0 will result in FullLanguage and value of 4 will shift it to ConstrainedLanguage.

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  • Is it by default or only session/ when run? – Aoi. T_015 Feb 10 '18 at 8:31

No, you can place a PowerShell session into Constrained Language mode simply by setting a property:

PS C:\> $ExecutionContext.SessionState.LanguageMode

PS C:\> $ExecutionContext.SessionState.LanguageMode = "ConstrainedLanguage"

PS C:\> $ExecutionContext.SessionState.LanguageMode

PS C:\> [System.Console]::WriteLine("Hello")

Cannot invoke method. Method invocation is supported only on core types in this language mode.
At line:1 char:1
+ [System.Console]::WriteLine("Hello")
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [], RuntimeException
    + FullyQualifiedErrorId : MethodInvocationNotSupportedInConstrainedLanguage

For more details, read this official document: What is PowerShell Constrained Language? https://blogs.msdn.microsoft.com/powershell/2017/11/02/powershell-constrained-language-mode/

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  • if it's already in ConstraingedLanguage mode, it can't be set to FullLanguage with this method – K.H. B Jun 19 '19 at 1:53

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