This Windows 11 bug could breach Windows security


key takeaways

  • Executing a specific command in the Command Prompt can cause the Windows Security app to show a blank screen.
  • The core functions of the app, such as real-time protection and scanning, remain enabled, but users cannot view scan results due to the bug.
  • There is currently no known way to recover the Windows Security app without reinstalling Windows or performing a system restore.



The last few days have not been good for Windows 11 users. This is because Windows 11 users were widely reporting that their PCs were hit with several bugs after installing the June 2024 Preview Update (KB5039302). Microsoft acknowledges those reported problems and is currently working on finding a solution. However, things got even worse when someone discovered that Windows 11 might have an unknown bug, as Microsoft seems unaware of the issue.


An unknown bug lets the Windows Security app in Windows 11 be hacked

Windows Security app showing blank screen in the screenshot


The Windows Security app does an overall good job of protecting your PC from threats, but executing a simple command can render the app useless. A user on the Microsoft Community website first brought it to our attention that the Windows Security app no ​​longer works after he executed the following command in a command prompt with administrator privileges:

regsvr32.exe C:\Windows\system32\SecurityHealthProxyStub.dll

We also executed the command on our PC running on Windows 11, version 23H2, after which we noticed that the Windows Security app only shows a blank screen. In other words, you cannot use the app to scan for malware and find ways to fix security issues.


Screenshot showing Command Prompt in Windows 11

The user also reported that it only affects Windows 11 PCs, not Windows 10. Interestingly, when we executed the command on our PC running Windows 11 Insider build, we did not see the Windows Security app showing a blank screen, unlike the Windows 11 23H2 PC.


What are 'regsvr.exe' and 'SecurityHealthProxyStub.dll'?

The primary use of 'regsvr.exe' is to allow users to manually register DLLs when they are not registered during the Windows installation process. On the other hand, 'SecurityHealthProxyStub.dll' is a core component of your system security and is responsible for security health monitoring. It is registered and installed during the Windows installation process, so it is pointless to register 'SecurityHealthProxyStub.dll' when it is already registered on your system.

How can you recover the Windows Security app?

As the user pointed out, there is no way to get the Windows Security app back to its original working state without reinstalling it or performing a system restore. So, if you are running Windows 11, it is better for you not to execute the command on your main computer even if you are curious.


Does it really hamper your system security?

Screenshot showing the PowerShell command

There is no clear answer to this question yet. After running the command and getting a blank screen when opening the Windows Security app, we opened Windows PowerShell with administrator privileges and ran the following command to see if real-time protection is currently enabled on your PC:

Get-MpPreference | Select RealTimeProtectionEnabled

The output that appeared on the screen was 'RealTimeProtectionEnabled', indicating that protection is enabled. We then also performed a quick scan by running the following PowerShell command:


Start-MPScan -ScanType QuickScan

It returns nothing on the screen. Instead, it silently scans your PC for malware and shows the status on the Windows Security app. But since the Windows Security app only shows a blank screen, you can't see anything on it. If the Windows Security app was working properly, you would have seen details like the number of files scanned, the exact time when scanning was completed, and the number of threats found. You can usually see these important details by opening the Windows Security app and going to Virus and threat protection Page.

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