XenServer Security Update for Multiple Issues
Article Id : CTX697316
Last Modified Date : 11-10-2026 18:14
Created Date : 11-10-2026 18:15
Article Record Type : Security BulletinSeverity :
High
Summary
Severity: High
Description of Problem
An issue has been identified that may allow an unauthenticated attacker on the management network to eventually infer the Pool Secret and so compromise the host.
This issue has the following identifier:
- CVE-2026-102705
Several further issues have been identified that may allow
- an already authenticated host administrator with a Pool Operator, VM Power Administrator or VM Administrator role to escalate their privilege to that of a Pool Administrator role
- an already authenticated host administrator with any role to terminate running tasks belonging to other roles.
These issues have the following identifiers:
- CVE-2026-102706
- CVE-2026-102707
- CVE-2026-102708
- CVE-2026-119779
- CVE-2026-119780
In addition, AMD has disclosed several security issues affecting AMD CPUs. Although these are not vulnerabilities in the XenServer product itself, for the convenience of customers we are providing updates that contain updated AMD microcode and corresponding product code changes to mitigate these CPU hardware issues. Hosts that do not contain AMD CPUs are not affected by these CPU issues.
The first of these issues may, under certain circumstances, allow a guest VM to compromise the host. Further details may be found at https://www.amd.com/en/resources/product-security/bulletin/amd-sb-3060.html.
This issue has the following identifier:
- CVE-2024-21963
The remaining CPU hardware issues may allow code in a guest VM to infer some active memory content of another VM that is running on the same host. Hosts that do not contain AMD Zen5 CPUs are not affected by these remaining CPU issues.
These issues have the following identifiers:
- CVE-2024-36350
- CVE-2024-36357
- CVE-2026-0004
Affected Versions
These issues affect both XenServer 8.4 and XenServer 9.
Details
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
Customers who wish to rotate the Pool Secret should follow the instructions at https://docs.xenserver.com/us/en/xenserver/8/hosts-pools/manage-pools.html#rotate-the-pool-secret or https://docs.xenserver.com/us/en/xenserver/9/hosts-pools/manage-pools.html#rotate-the-pool-secret
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