PowerShell Constrained Language Mode (CLM) Bypass via Downgrade or Non-Standard Host

Ankit Mehta@Secvyn

•updated Jun 26, 2026•0•0•3

Detects techniques used to bypass PowerShell Constrained Language Mode (CLM) including version downgrades, execution from trusted binary proxy hosts (such as InstallUtil, MSBuild, or Regasm), and manipulation of the __PSLockDownPolicy environment variable.