Update KB4491113 fixes Internet Explorer Backslash bug

Windows UpdateMicrosoft has released a cumulative update KB4491113 for Internet Explorer, which fixes the so-called backslash bug in the browser. This came into effect with the February 2019 updates in Windows 7-10.


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The IE Backslash bug

The security updates from February 2019 for Windows 7 SP1 and Windows 8.1 as well as Windows 10 and their server counterparts caused an error in Internet Explorer 11. I didn't explicitly mention it in the blog, but here it was mentioned – Microsoft added the following bug in the Known Issues section for Updates for Windows 7, Windows 8.1 and Windows 10:

After installing this update, Internet Explorer may fail to load images with a backslash (\) in their relative source path.

Workaround:

Change the backslash (\) to a forward slash (/) in the relative path of the image element.

Or

Change the relative path to the full URI path.

Microsoft is working on a resolution and will provide an update in an upcoming release.

Of course, it a problem, when someone in a corporate environment is dependent on Internet Explorer 11.

A fix is ready

Woody Leonhard now points out in this article that Microsoft has now provided a fix for this bug for Windows 7 SP1 and Windows 8.1. On February 19, 2019, Microsoft released the Cumulative update for Internet Explorer: February 19, 2019 KB4491113, which is intended to fix the problem.

This cumulative update includes improvements and fixes for Internet Explorer 11 that is running on Windows 8.1 or Windows 7, and resolves the following issue:

Internet Explorer cannot load images that have a backslash (\) in their relative sources path.

If someone is affected, they can install the IE update KB4491113. The update is available for download and manual installation via Microsoft Update Catalog. If you have installed language packs, you must reinstall them after applying the update. No restart is required after the update installation. 

Similar articles:
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Microsoft Security Update Summary (February 12, 2019)
Patchday: Updates for Windows 7/8.1/Server 12. Feb. 2019
Patchday Windows 10 Updates (February 12, 2019)
Patchday Microsoft Office Updates ( February 12, 2019)
Microsoft Patchday: Other Updates February 12, 2019


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3 Responses to Update KB4491113 fixes Internet Explorer Backslash bug

  1. Amir says:

    Does anyone know how to get this for windows 10? its not showing in the update catalog

  2. Viorel says:

    Hello, I don't think there is an update available for Windows 10 for now. We have Win10 1507, build 10240 and we just decline the update from WSUS server and then instructed our users to manually uninstall the update KB4487018 (it was installed only on our IT workstations).

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