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SharedArrayBufferUnrestrictedAccessAllowed

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Specifies whether SharedArrayBuffers can be used in a non cross-origin-isolated context

Supported versions

  • On Windows and macOS since 92 or later

Description

Specifies whether SharedArrayBuffers can be used in a non cross-origin-isolated context. A SharedArrayBuffer is a binary data buffer that can be used to create views on shared memory. SharedArrayBuffers have a memory access vulnerability in several popular CPUs.

If you enable this policy, sites are allowed to use SharedArrayBuffers with no restrictions.

If you disable or don't configure this policy, sites are allowed to use SharedArrayBuffers only when cross-origin isolated.

Microsoft Edge will require cross-origin isolation when using SharedArrayBuffers from Microsoft Edge 91 onward for Web Compatibility reasons.

Supported features

  • Can be mandatory: Yes
  • Can be recommended: No
  • Dynamic Policy Refresh: No - Requires browser restart
  • Per Profile: Yes
  • Applies to a profile that is signed in with a Microsoft account: Yes

Data type

  • Boolean

Windows information and settings

Group Policy (ADMX) info

  • GP unique name: SharedArrayBufferUnrestrictedAccessAllowed
  • GP name: Specifies whether SharedArrayBuffers can be used in a non cross-origin-isolated context
  • GP path (Mandatory): Administrative Templates/Microsoft Edge
  • GP path (Recommended): N/A
  • GP ADMX file name: MSEdge.admx

Example value

Enabled

Registry settings

  • Path (Mandatory): SOFTWARE\Policies\Microsoft\Edge
  • Path (Recommended): N/A
  • Value name: SharedArrayBufferUnrestrictedAccessAllowed
  • Value type: REG_DWORD

Example registry value

0x00000001

Mac information and settings

  • Preference Key name: SharedArrayBufferUnrestrictedAccessAllowed
  • Example value:
<true/>

See also