Specify threat alert levels at which default action should not be taken when detected: registry value Threats_ThreatSeverityDefaultAction (ThreatSeverityDefaultAction)ComputerHKLM\Software\Policies\Microsoft\Windows Defender\Threats\ThreatSeverityDefaultAction

Policy ID: Threats_ThreatSeverityDefaultAction
Scope: Computer Configuration
Supported on: At least Windows Server 2012, Windows 8 or Windows RT
Source: Administrative Templates (.admx) for Windows 11 2026 Update (26H2) (version 1.0)
Category: Windows Components › Microsoft Defender Antivirus › Threats

Registry

Threats_ThreatSeverityDefaultAction

-Computer

HKLM\Software\Policies\Microsoft\Windows Defender\Threats

(list values)

REG_SZComputer

HKLM\Software\Policies\Microsoft\Windows Defender\Threats\ThreatSeverityDefaultAction Current key

Enabled value: Depends on the option value
Element: Specify threat alert levels at which default action should not be taken when detected
Value type: REG_SZ
Add to existing value: true
Explicit value name: true

Apply with .reg · CMD · PowerShell

.reg

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows Defender\Threats\ThreatSeverityDefaultAction]
"<enter name>"="<enter value>"

CMD

reg add "HKLM\Software\Policies\Microsoft\Windows Defender\Threats\ThreatSeverityDefaultAction" /v "<enter name>" /t REG_SZ /d "<enter value>" /f

PowerShell

New-Item -Path 'HKLM:\Software\Policies\Microsoft\Windows Defender\Threats\ThreatSeverityDefaultAction' -Force | Out-Null
New-ItemProperty -Path 'HKLM:\Software\Policies\Microsoft\Windows Defender\Threats\ThreatSeverityDefaultAction' -Name '<enter name>' -PropertyType String -Value '<enter value>' -Force | Out-Null