Micropatches Released for Microsoft Management Console Security Feature Bypass Vulnerability (CVE-2025-26633)

 

March 2025 Windows updates brought a fix for CVE-2025-26633, a security feature bypass vulnerability in Windows that allows a malicious script to bypass one of the security warnings displayed when opening a Microsoft Console (.msc) file that was loaded from the Internet.

The vulnerability was reported to Microsoft by security researcher Aliakbar Zahravi with Trend Micro.

Aliakbar also published a detailed analysis of this vulnerability, which allowed us to reproduce the issue and create our own patches for security-adopted Windows versions that are no longer receiving updates from Microsoft.

 

Microsoft's Patch

Microsoft patched this issue by preventing users from launching .msc files marked with Mark of the Web (MotW).

 

Our Micropatch

Our patch does the exact same thing as Microsoft's.

Micropatch Availability

Micropatches were written for the following security-adopted versions of Windows with all available Windows Updates installed:

1. Windows 11 21H2 - fully updated
2. Windows 10 21H2 - fully updated
3. Windows 10 21H1 - fully updated
4. Windows 10 20H2 - fully updated
5. Windows 10 2004 - fully updated
6. Windows 10 1909 - fully updated
7. Windows 10 1809 - fully updated
8. Windows 10 v1803 - fully updated
9. Windows 7 - fully updated without ESU, with ESU 1, ESU 2 or ESU 3
10. Windows Server 2008 R2 - - fully updated without ESU, with ESU 1, ESU 2, ESU 3 or ESU 4
11. Windows Server 2012 - fully updated without ESU, with ESU 1
12. Windows Server 2012 R2 - fully updated without ESU, with ESU 1
    

 

Micropatches have already been distributed to, and applied on, all affected online computers with 0patch Agent in PRO or Enterprise accounts (unless Enterprise group settings prevented that). 

Vulnerabilities like these get discovered on a regular basis, and attackers know about them all. If you're using Windows that aren't receiving official security updates anymore, 0patch will make sure these vulnerabilities won't be exploited on your computers - and you won't even have to know or care about these things.

If you're new to 0patch, create a free account in 0patch Central, start a free trial, then install and register 0patch Agent. Everything else will happen automatically. No computer reboot will be needed.

We would like to thank security researcher Aliakbar Zahravi with Trend Micro for publishing their analysis, which made it possible for us to create a micropatch for this issue.

Did you know 0patch will security-adopt Windows 10 when it goes out of support in October 2025, allowing you to keep using it for at least 5 more years? Read more about it here.

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