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Article ID: 2617986 - Last Review: October 25, 2011 - Revision: 2.0

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Microsoft has released security bulletin MS11-078. To view the complete security bulletin, visit one of the following Microsoft websites:

How to obtain help and support for this security update

For home users, no-charge support is available by calling (866) PCSAFETY in the United States and Canada or by contacting your local Microsoft subsidiary. For more information about how to contact your local Microsoft subsidiary for support issues with security updates, visit the Microsoft International Support website: (
North American customers can also obtain instant access to unlimited no-charge email support or to unlimited individual chat support by visiting the following Microsoft website: (
For enterprise customers, support for security updates is available through your usual support contacts.

More information about this security update

Update information

Microsoft Silverlight is a cross-browser, multi-environment plug-in that delivers the next generation of Microsoft .NET-based media experiences and rich interactive applications for the web.

This update offers a new build (version 4.0.60831.0) that is an upgrade to earlier versions of Silverlight. This update is included in current Silverlight installers. 

This update is available from the following sources:
Silverlight site
The Silverlight installer includes all earlier updates in addition to this update. To install the latest version of Silverlight on your computer, visit the following Microsoft website:
Get Microsoft Silverlight (
Microsoft update and Windows Server Update Services (WSUS)
If you have an earlier version of Silverlight installed on your computer, this update is available from Microsoft Update and Windows Server Update Services (WSUS) as an important update and will be offered as the following:
Update for Microsoft Silverlight (KB 2617986)
If you do not have an earlier version of Silverlight installed, this update is also available from Microsoft Update and Windows Server Update Services (WSUS) as an optional update and will be offered as the following:
Microsoft Silverlight (KB 2617986)

How to hide this update so that it does not appear again

Click here to view or hide detailed information

Removal information

To uninstall Silverlight, visit the following Microsoft website, and then click Uninstall Silverlight:
Get Microsoft Silverlight (

Security update replacement information

This security update does not replace a previously released security update.

File information

The English (United States) version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.
Collapse this tableExpand this table
File nameFile versionFile sizeDateTime


For more information about Silverlight, visit the following Microsoft websites:
Silverlight administration (
Microsoft Silverlight (
Silverlight developer resources (
To report issues about this update or to send any feedback to the Microsoft Silverlight development team, visit the following Microsoft website:
Microsoft Connect (

  • Microsoft Silverlight 4
kbsecvulnerability kbsecurity kbsecbulletin kbfix kbexpertiseinter kbbug atdownload KB2617986
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