KB5082806: Cumulative security update for Internet Explorer: April 14, 2026

Important Certain versions of Microsoft Internet Explorer have reached the end of support. Note that some versions of Internet Explorer may be supported past the latest OS end date when Extended Security Updates (ESUs) are available. See Lifecycle FAQ - Extended Security Updates for a list of products offering ESUs.

To continue receiving security and quality updates, we recommend that you upgrade to Microsoft Edge.

Windows Secure Boot certificate expiration

Important: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026. This might affect the ability of certain personal and business devices to boot securely if not updated in time. To avoid disruption, we recommend reviewing the guidance and taking action to update certificates in advance.

For details and preparation steps for Windows devices, see Windows Secure Boot certificate expiration and CA updates.

For details and preparation steps for Windows servers, see the following resources:

Support for Windows Server 2008 has ended

Windows Server 2008 Premium Assurance ended on January 13, 2026.

Windows Server 2008 Extended Security Updates (ESU) ended on January 10, 2023. Additionally, Extended Security Updates on Azure only support ended on January 9, 2024. For more information, see Extended Security Updates for Windows Server overview.

We recommend that you upgrade to a later version of Windows Server. For more information, see Overview of Windows Server upgrades.

Summary

This security update resolves vulnerabilities in Internet Explorer. To learn more about these vulnerabilities, see Deployments | Security Update Guide.

Additionally, see the following articles for more information about cumulative updates:

This update applies to the following:

Internet Explorer 11 for Windows Server 2012 R2
Internet Explorer 11 for Windows Server 2012

Reminders

The improvements that are included in this Internet Explorer update are also included in the April 2026 Monthly Rollup. Installing either this Internet Explorer update or the Monthly Rollup installs the same improvements.
This update is not applicable for installation on a device on which the Monthly Rollup from April 2026 (or a later month) is already installed. This is because that update contains all the same improvements that are included in this Internet Explorer update.
If you use update management processes other than Windows Update and you automatically approve all security update classifications for deployment, this update and the April 2026 Monthly Rollup are deployed. We recommend that you review your update deployment rules to make sure that the desired updates are deployed.
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.

Known issues in this security update

We are currently not aware of any issues in this update.

How to get and install this update

Install this update

To install this update, use one of the following release channels.

Available	Next step
	This update is not available from Windows Update. See the Update Catalog, Update for Business, or the Server Update Services release channel.

File information

A list of the files that are included in this update are provided in a CSV (Comma delimited) (*.csv) file. The file can be opened in a text editor such as Notepad or in Microsoft Excel.

Note: The English (United States) version of this software update might contain files for additional languages.

Download Icon Download the file information for update KB5082806.