Citrix Director - unable to shadow session (remote assist) after OS patching in January
Article ID: CTX695983
Updated On:
Description
Citrix Director provides the invite file, and it can be downloaded without any issues.
Launch attempt fails with the error:
The events observed in the Event logs (Source: RemoteAssistance):
- Remote Assistance started with: -openfile "C:\Users\AdminUser\Downloads\Invite.msrcincident" as the command line parameters.
- The error message: The file could be corrupted, and it should be verified before trying again. If the problem persists, contact your system administrator. has been shown to the user.
- Remote Assistance has ended.
Environment
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Cause
Citrix is currently investigating the issue.
Resolution
Citrix is currently investigating the issue.
Workaround:
Customers who use the latest version of CVAD and Director can use a new functionality: HDX Screen Sharing.
https://docs.citrix.com/en-us/citrix-virtual-apps-desktops/whats-new
Administrators / Help Desk users should be able to offer assistance using "msra.exe /offerra".
HDX Screen sharing for Director
HDX Screen sharing is available for shadowing using Citrix Director for Citrix Virtual Apps and Desktops on-premises installations and Citrix Monitor for Citrix Cloud deployments. HDX Screen sharing is the new method for shadowing and provides a native, low latency alternative to the current shadowing. HDX Screen sharing for Director is available for all VDAs, including non-domain joined and Entra ID joined VDAs.
Issue/Introduction
Citrix shadowing functionality is affected after recent Microsoft OS patching.
Invite file cannot be launched from the Windows machine with security update installed.
- Windows 11 Update KB5074109
- Windows Server 2022 Update KB5073457
- Windows Server 2025 Update KB5073379
- Full list of Windows releases and patches: https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-20824
The updates contain the fix for vulnerability CVE-2026-20824: Windows Remote Assistance Security Feature Bypass Vulnerability
Additional Information
This article will be updated during the investigation.
HDX Screen sharing:
https://docs.citrix.com/en-us/citrix-virtual-apps-desktops/whats-new
https://docs.citrix.com/en-us/citrix-virtual-apps-desktops/graphics/introduction/hdx-screen-sharing
