Windows security update Windows creates inetpub folder. Do not delete

[paulc]

Knowing many use Windows to self-host Jellyfin, I thought I would share that Windows released a security update that created an "inetpub" folder on the system drive. 

Microsoft warns users not to delete it, also.

At first, this freaked me out when I saw it because I don't use IIS webserver and seeing that folder appear on my C drive out the blue made me investigate. It has all the normal folders, including logs and wwwroot.

I thought I would pass that along in case anyone else sees it and starts fretting over why it suddenly appeared on their system drive.

More info for MS here : https://msrc.microsoft.com/update-guide/...2025-21204

Are the updates for Windows 10 for x64-based Systems and Windows 10 for 32-bit Systems currently available?
Yes. As of April 9, 2025, the security update (5055547) for Windows 10 for x64-based Systems and Windows 10 for 32-bit Systems are available. Customers running Windows 10 should ensure the update is installed to be protected from this vulnerability.

How could an attacker exploit this vulnerability?

An authenticated attacker who successfully exploits this vulnerability gains the ability to perform and/or manipulate file management operations on the victim machine in the context of the NT AUTHORITY\SYSTEM account.

Does installing the Windows security updates that address this CVE cause visible change on devices?

After installing the updates listed in the Security Updates table for your operating system, a new %systemdrive%\inetpub folder will be created on your device. This folder should not be deleted regardless of whether Internet Information Services (IIS) is active on the target device. This behavior is part of changes that increase protection and does not require any action from IT admins and end users.