What Customers Should Do  

We have pushed updates to both the Early Access and Normal update channels of each of XenServer 8.4 and XenServer 9.  We recommend that customers update to the latest version from their chosen channel following the instructions at https://docs.xenserver.com/us/en/xenserver/8/update.html or https://docs.xenserver.com/us/en/xenserver/9/update.html

We have released updated versions of Workload Balancing and Conversion Manager appliances at https://www.xenserver.com/downloads.  We recommend that customers update to versions 2026.1.1 or later of Workload Balancing and 2026.2.0 of Conversion Manager. 

What Citrix is Doing 

We are notifying customers and channel partners about this potential security issue through the publication of this security bulletin on the Citrix Knowledge Center at https://support.citrix.com/support-home/topic-article-list?trendingCategory=20&trendingTopicName=Security%20Bulletin  

Obtaining Support on This Issue  

If you require technical assistance with this issue, please contact Citrix Technical Support. Contact details for Citrix Technical Support are available at https://www.citrix.com/support 

Subscribe to Receive Alerts  

Citrix strongly recommends that all customers subscribe to receive alerts when a security bulletin is created or modified at https://support.citrix.com/wolken-support/view/aboutsupport/my-support-alerts  

Reporting Security Vulnerabilities to Citrix 

Citrix welcomes input regarding the security of its products and considers any and all potential vulnerabilities seriously. For details on our vulnerability response process and guidance on how to report security-related issues to Citrix, please see the following webpage: https://www.cloud.com/trust-center/support  

Change Log

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Severity: Critical 

Description of Problem  

An issue has been identified that may allow an unauthenticated attacker on the management network to compromise the host and/or any running Workload Balancing (WLB) or Conversion Manager appliances. 

This issue has the following identifier: 

• CVE-2026-98432 

A further issue may allow a privileged user in a guest VM to compromise the host. 

This issue has the following identifiers: 

• CVE-2026-102703 

A further group of issues may allow a malicious unauthenticated attacker on the same network to compromise a network-booting (PXE boot) VM during the initial booting stage or allow the guest VM administrator to bypass the guest VM's secure boot policy. 

These issues have the following identifiers: 

• CVE-2026-97631 

• CVE-2026-45447 

• CVE-2024-38797 

• CVE-2024-38796 

• CVE-2022-36764 

• CVE-2022-36763 

Affected Versions  

All the above issues affect both XenServer 8.4 and XenServer 9. CVE-2026-98432 also affects Workload Balancing (before 2026.1.1) and Conversion Manager (before 2026.2.0).