Powershell CLM

Under ConstrainedLanguage, scripts that are located in whitelisted locations or otherwise comply with a whitelisting rule can execute with full functionality. However, if a script does not comply with the rules, or if commands are entered directly on the command line, ConstrainedLanguage imposes numerous restrictions. The most significant limitation excludes calls to the .NET framework, execution of C# code and reflection.

powershell $ExecutionContext.SessionState.LanguageMode
ConstrainedLanguage

powershell $ExecutionContext.SessionState.LanguageMode
FullLanguage

Simple bypass (if meterpreter) -> Powershell module