Enable opaque origins for data URLs in Web Workers
Verified with Microsoft Edge 152.0.4191.53 — updated on July 10, 2026
Supported on: Microsoft Edge version 149, Windows 7 or later
Path in the GPO console
Computer Configuration\Administrative Templates\Microsoft Edge User Configuration\Administrative Templates\Microsoft Edge Description
This policy controls whether Web Workers created from data URLs are assigned a unique opaque origin. Web Workers can be created using a data URL that contains the worker script. Previously, these workers inherited the origin of the page that created them, which allowed them to access the same origin-bound data, such as local storage and cookies. Starting in Microsoft Edge version 149, Web Workers created from data URLs are assigned a unique opaque origin by default. This behavior improves security and aligns with the HTML specification by isolating these workers from the page that created them. If you enable this policy or don't configure it, Web Workers created from data URLs are assigned a unique opaque origin. If you disable this policy, Web Workers created from data URLs inherit the origin of the page that created them. Use this setting only as a temporary mitigation for compatibility issues with internal applications that depend on the legacy behavior. This policy is temporary and will be removed in Microsoft Edge version 157.
Registry
Software\Policies\Microsoft\Edge Software\Policies\Microsoft\Edge Value name: DataUrlInWebWorkerOpaqueOriginEnabled
Enabled: DataUrlInWebWorkerOpaqueOriginEnabled = 1
Disabled: DataUrlInWebWorkerOpaqueOriginEnabled = 0
Export Builder
BETAConfigure the state, scope and options, then generate .reg, PowerShell, Intune and SCCM outputs — or add the setting to a multi-setting collection.
These exports write the registry — this is not a managed GPO. ⓘ
Applying both scopes creates an ambiguous configuration (computer takes precedence over user). Only do this intentionally.
.reg file
Windows Registry Editor Version 5.00
; Exported from gporais.com
; Policy: Enable opaque origins for data URLs in Web Workers
; State: Enabled
; Scope: Computer (HKLM)
; Supported on: Microsoft Edge version 149, Windows 7 or later
[HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Edge]
"DataUrlInWebWorkerOpaqueOriginEnabled"=dword:00000001More formats (PowerShell, Intune, SCCM)
PowerShell
# Exported from gporais.com
# Policy: Enable opaque origins for data URLs in Web Workers
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Microsoft Edge version 149, Windows 7 or later
$path = 'HKLM:\Software\Policies\Microsoft\Edge'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'DataUrlInWebWorkerOpaqueOriginEnabled' -Value 1 -Type DWordIntune XML
No direct Policy CSP / OMA-URI mapping for this policy. Use the Intune Remediation tab, or ingest the ADMX in Intune.Intune Remediation
# === Detection script ===
# Exported from gporais.com
# Policy: Enable opaque origins for data URLs in Web Workers
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Microsoft Edge version 149, Windows 7 or later
function Test-RegistryValue {
param(
[Parameter(Mandatory = $true)][string]$Path,
[Parameter(Mandatory = $true)][string]$Name,
[object]$Expected,
[ValidateSet('String', 'DWord', 'MultiString')][string]$Kind = 'String',
[switch]$Absent
)
try {
$item = Get-ItemProperty -LiteralPath $Path -Name $Name -ErrorAction Stop
} catch {
return $Absent.IsPresent
}
if ($Absent.IsPresent) { return $false }
$actual = $item.$Name
if ($Kind -eq 'DWord') { return ([int64]$actual) -eq ([int64]$Expected) }
if ($Kind -eq 'MultiString') {
$actualValues = @($actual)
$expectedValues = @($Expected)
if ($actualValues.Count -ne $expectedValues.Count) { return $false }
for ($i = 0; $i -lt $expectedValues.Count; $i++) {
if ([string]$actualValues[$i] -ne [string]$expectedValues[$i]) { return $false }
}
return $true
}
return [string]$actual -eq [string]$Expected
}
$checks = @(
(Test-RegistryValue -Path 'HKLM:\Software\Policies\Microsoft\Edge' -Name 'DataUrlInWebWorkerOpaqueOriginEnabled' -Expected 1 -Kind DWord)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Enable opaque origins for data URLs in Web Workers
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Microsoft Edge version 149, Windows 7 or later
$path = 'HKLM:\Software\Policies\Microsoft\Edge'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'DataUrlInWebWorkerOpaqueOriginEnabled' -Value 1 -Type DWordSCCM scripts
# Exported from gporais.com
# Policy: Enable opaque origins for data URLs in Web Workers
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Microsoft Edge version 149, Windows 7 or later
# SCCM Configuration Item guidance:
# Create a Configuration Item of type "Setting: Script".
# Discovery script: use the Detection script below.
# Remediation script: use the Remediation script below.
# Compliance rule: the Discovery script output equals 'Compliant'.
# === Detection script ===
# Exported from gporais.com
# Policy: Enable opaque origins for data URLs in Web Workers
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Microsoft Edge version 149, Windows 7 or later
function Test-RegistryValue {
param(
[Parameter(Mandatory = $true)][string]$Path,
[Parameter(Mandatory = $true)][string]$Name,
[object]$Expected,
[ValidateSet('String', 'DWord', 'MultiString')][string]$Kind = 'String',
[switch]$Absent
)
try {
$item = Get-ItemProperty -LiteralPath $Path -Name $Name -ErrorAction Stop
} catch {
return $Absent.IsPresent
}
if ($Absent.IsPresent) { return $false }
$actual = $item.$Name
if ($Kind -eq 'DWord') { return ([int64]$actual) -eq ([int64]$Expected) }
if ($Kind -eq 'MultiString') {
$actualValues = @($actual)
$expectedValues = @($Expected)
if ($actualValues.Count -ne $expectedValues.Count) { return $false }
for ($i = 0; $i -lt $expectedValues.Count; $i++) {
if ([string]$actualValues[$i] -ne [string]$expectedValues[$i]) { return $false }
}
return $true
}
return [string]$actual -eq [string]$Expected
}
$checks = @(
(Test-RegistryValue -Path 'HKLM:\Software\Policies\Microsoft\Edge' -Name 'DataUrlInWebWorkerOpaqueOriginEnabled' -Expected 1 -Kind DWord)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Enable opaque origins for data URLs in Web Workers
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Microsoft Edge version 149, Windows 7 or later
$path = 'HKLM:\Software\Policies\Microsoft\Edge'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'DataUrlInWebWorkerOpaqueOriginEnabled' -Value 1 -Type DWordBuilding a multi-setting collection? Add this setting and generate combined .reg / PowerShell / GPO scripts.