KB5123038: Overview with user sentiment and feedback

Overview

KB5123038 is a cumulative security update for Internet Explorer 11, released September 8, 2026. It applies only to Windows Server 2012 R2 and Windows Server 2012 (ESU). The Microsoft support page notes the same improvements are also included in the September 2026 Monthly Rollup, so it is not needed on systems already running that rollup or later.

General Purpose

• Resolves security vulnerabilities in Internet Explorer 11 (details in the MSRC Security Update Guide)
• Targets Windows Server 2012 R2 and Windows Server 2012 ESU installations only
• Content is identical to the September 2026 Monthly Rollup; installing either delivers the same fixes
• Not applicable if the September 2026 (or later) Monthly Rollup is already installed
• Language packs installed after this update require reinstalling it

General Sentiment

Little community discussion was available in the crawled data, so no substantive user feedback could be assessed. Microsoft lists no known issues for this update. Its scope is narrow (legacy IE on older server OSes), which limits exposure to any problems.

Known Issues

Disclaimer: We take measures to ensure that AI-generated content is of the highest possible quality, but we cannot guarantee its accuracy and recommend that users do their own independent research. Generated on 2026-10-31 01:59 PM

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