Win 7/8.1: Internet Explorer Update KB4505050 (05/18/2019)

[German]A brief note for Windows users: Microsoft released the KB4505050 cumulative update for Internet Explorer on May 18, 2019. This is a patch that fixes a bug caused from IE 11 update released on last Patchday (May 14, 2019).


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I’ve been alerted about to the new update KB4505050 by both mail and comment from blog readers (thanks for that, but it was Sunday, so the article had to wait).

Issues caused by IE Update KB4499164

As of May 14, 2019, Microsoft released cumulative update KB4499164 for Windows 7 and Windows Server 2008 R2. For Windows 8.1 and its server counterpart there was also a corresponding update KB4499151 (see my blog post Patchday: Updates for Windows 7/8.1/Server (May 14, 2019)).

Adds “uk.gov” into the HTTP Strict Transport Security Top Level Domains (HSTS TLD) for Internet Explorer and Microsoft Edge.

Microsoft has published the improvements mentioned above in both kb articles (for Windows 7 this clause was added later). “uk.gov” has been added to the HTTP Strict Transport Security Top Level Domains (HSTS TLD) list for Internet Explorer and Microsoft Edge. As a result, British websites could suddenly no longer be accessed in Internet Explorer. Microsoft has added the following text to the known issues section of the relevant KB articles:

After installing the May 14, 2019 update, some gov.uk websites that don’t support HTTP Strict Transport Security (HSTS) may not be accessible through Internet Explorer 11 or Microsoft Edge.

The problem was that some gov.uk websites simply did not support HTTP Strict Transport Security (HSTS).

Cumulative IE Update KB4505050

On May 18, 2019, Microsoft then released the  cumulative update KB4505050for Internet Explorer 11 on the following platforms:


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  • Windows Server 2012 R2
  • Windows Server 2012
  • Windows Server 2008 R2 SP1
  • Windows 8.1 Update
  • Windows 7 SP1
  • Windows Embedded 8 Standard

At this point I would like to point out that Microsoft does not provide an update for Internet Explorer 11 under Windows 10. There, the cumulative updates of May 14, 2019 also introduced HSTS TLD for the gov.uk Top Level Domain and bricked some websites with it. 

This cumulative update for Internet Explorer 11 includes beside the following fix also the quality improvements of Update KB4498206. However, the latter update was the Internet Explorer cumulative security update dated May 14, 2019 (the KB article is now dated May 18, 2019). The new cumulative IE 11 update KB4505050 fixes the following bug:

Addresses an issue that may prevent access to some gov.uk websites that don’t support HTTP Strict Transport Security (HSTS) when using Internet Explorer 11 or Microsoft Edge.

In other words: The problem created with the update of 14 May 2019 is to be solved again with Internet Explorer. Interesting are the following important hints from the KB article:

  • The improvements in this update are not included in the Monthly Rollups released May 14, 2019, such as KB4499164 (Windows 7 SP1 and Windows Server 2008 R2 SP1), KB4499171 (Windows Server 2012 and Windows Embedded 8 Standard), or KB4499151 (Windows 8.1 and Windows Server 2012 R2).

  • If you install a language pack after you install this update, you must reinstall this update. Therefore, we recommend that you install any language packs that you need before you install this update. For more information, see Add language packs to Windows.

This update does not contain any fixes that were included in the May 14, 2019 updates. And if you install a language pack afterwards, you have to reinstall the update (but this is an old bad practice with Microsoft updates).

The patch is rolled out once via Windows Update and should reach the affected machines automatically. Alternatively you can download and install the update from the Microsoft Update Catalog. Under Windows Server 2012 KB4492872 has to be installed before, because it updates the browser to Internet Explorer 11.

Similar articles:
Microsoft Security Update Summary (May 14, 2019)
Patchday: Updates for Windows 7/8.1/Server (May 14, 2019)
Patchday Windows 10 Updates (May 14, 2019)
Patchday Microsoft Office Updates (May 14, 2019)


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