Windows MSHTML Platform Security Feature Bypass Vulnerability

According to the CVSS metric, successful exploitation of this vulnerability could lead to some loss of integrity (I:L) and some loss of availability (A:L). What does that mean for this vulnerability?
An attacker who successfully exploits the vulnerability could craft a malicious URL that would evade zone checks, resulting in a limited loss of integrity and availability on the victim machine.

Are there additional steps that I need to take to be protected from this vulnerability?
Yes. Customers must install the updates for CVE-2023-23397 and CVE-2023-29324 to be fully protected. For more information, please see the MSRC Blog Post relating to CVE-2023-23397 here: Microsoft Mitigates Outlook Elevation of Privilege Vulnerability.

The Security Updates table indicates that this vulnerability affects all supported versions of Microsoft Windows. Why are IE Cumulative updates listed for Windows Server 2008, Windows Server 2008 R2, Windows Server 2012, and Windows Server 2012 R2?
While Microsoft has announced retirement of the Internet Explorer 11 application on certain platforms and the Microsoft Edge Legacy application is deprecated, the underlying MSHTML, EdgeHTML, and scripting platforms are still supported. The MSHTML platform is used by Internet Explorer mode in Microsoft Edge as well as other applications through WebBrowser control. The EdgeHTML platform is used by WebView and some UWP applications. The scripting platforms are used by MSHTML and EdgeHTML but can also be used by other legacy applications. Updates to address vulnerabilities in the MSHTML platform and scripting engine are included in the IE Cumulative Updates; EdgeHTML and Chakra changes are not applicable to those platforms.
To stay fully protected, we recommend that customers who install Security Only updates install the IE Cumulative updates for this vulnerability.

Security updates
10.0.17763.4377 — https://support.microsoft.com/help/5026362
10.0.20348.1726 — https://support.microsoft.com/help/5026370
10.0.20348.1724 — https://support.microsoft.com/help/5026456
10.0.19042.2965 — https://support.microsoft.com/help/5026361
10.0.22000.1936 — https://support.microsoft.com/help/5026368
10.0.22621.1702 — https://support.microsoft.com/help/5026372
10.0.10240.19926 — https://support.microsoft.com/help/5026382
10.0.14393.5921 — https://support.microsoft.com/help/5026363
6.0.6003.22070 — https://support.microsoft.com/help/5026408
6.0.6003.22070 — https://support.microsoft.com/help/5026427
1.1.0.0 — https://support.microsoft.com/help/5026366
6.1.7601.26519 — https://support.microsoft.com/help/5026413
6.1.7601.26519 — https://support.microsoft.com/help/5026426
6.2.9200.24266 — https://support.microsoft.com/help/5026419
6.2.9200.24266 — https://support.microsoft.com/help/5026411
6.3.9600.20969 — https://support.microsoft.com/help/5026415
6.3.9600.20969 — https://support.microsoft.com/help/5026409