Improve Internet Explorer’s security by disabling JScript

by Loredana Harsana
Loredana Harsana
Loredana Harsana
Managing Editor
Loredana is a passionate writer with a keen interest in PC software and technology. She started off writing about mobile phones back when Samsung Galaxy S II was... read more
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  • Internet Explorer 11 users can disable JScript execution after installing the monthly security updates.
  • Follow the below steps to toggle off the JScript execution for Internet Zone and Restricted Sites Zone.
  • Since you still use Internet Explorer to connect on the web, take a look at our Web Browsers section.
  • You can also bookmark this Security & Privacy Software Hub for more easy-to-apply tips and tricks.
How to improve Internet Explorer's security

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Microsoft says that Internet Explorer 11 users can disable JScript execution after installing the Windows October 2020 monthly security updates.

For those who don’t know, JScript is Microsoft’s dialect of the ECMAScript language specification in the form of an Active Scripting engine.

The newly introduced option to block Jscript (Jscript.dll) execution is essential when it comes to offering an improved browsing experience in terms of security.

Microsoft recommends that users disable the legacy JScript execution for websites in the Internet and Restricted Sites zones. The reasons behind this decision are revealed by Microsoft:

Blocking Jscript helps protect against malicious actors targeting the JScript scripting engine while maintaining user productivity as core services continue to function as usual.

How to disable JScript in Internet Explorer?

JScript in Internet Explorer
  1. Click Start > Run.
  2. Up next, type regedt32 or simply regedit and click OK.
  3. Locate this registry subkey in Registry Editor in order to disable JScript execution in Internet Zone: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3\140D
  4. You need to locate the following registry subkey in Registry Editor if you want to disable JScript execution in Restricted Sites Zone: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\4\140D
  5. Right-click the appropriate registry subkey, then click Modify.
  6. Type 3 in the Edit DWORD (32-bit) Value dialog box.
  7. Click OK to confirm your action.
  8. Finally, restart Internet Explorer for the changes to take place.

In order to toggle off the JScript execution in Internet Explorer for Internet Zone and Restricted Sites Zone, you need to go through the procedures described above.

After you make the changes, the browser will not run JScript from websites that are in the Internet Zone or Restricted Sites Zone and that use Internet Explorer’s legacy document modes (Internet Explorer 9 and prior versions).

Adding this option is a chance for IT admins and not only to assure a secure browsing experience across enterprise environments.

Moreover, Microsoft will continue to provide security updates for JScript via the latest cumulative updates for Windows 10, and Cumulative Updates for Internet Explorer 11, so it’s a matter of waiting.

Let us know in the comments area below if you’ve also managed to disable JScript in Internet Explorer.

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