SB2026043083 - Two vulnerabilities in Citrix XenServer

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Main Vulnerability Database SB2026043083

SB2026043083 - Two vulnerabilities in Citrix XenServer

Published: April 30, 2026

Security Bulletin ID SB2026043083
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 vulnerabilities.


1) Improper access control (CVE-ID: CVE-2026-23562)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a remote user to access unintended host hardware.

The vulnerability exists due to improper access control in a PCI passthrough API when configuring PCI passthrough. A remote user can invoke the API without the intended pool-admin restriction to access unintended host hardware.

The vulnerability is exposed only when RBAC is configured for the pool.


2) Improper access control (CVE-ID: CVE-2026-42486)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a remote user to write arbitrary files in dom0.

The vulnerability exists due to improper access control in VM.platform:hvm_serial when modifying VM platform parameters. A remote user can set the hvm_serial parameter to write arbitrary files in dom0.

The vulnerability is exposed only when RBAC is configured for the pool.


Remediation

Install update from vendor's website.

References