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Citrix Security BulletinsCTX696836

XenServer Security Update for Multiple Issues

Several issues have been identified that affect XenServer 8.4 and XenServer 9. Collectively, these issues may allow a malicious privileged user in a guest VM to compromise or crash the host.

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HighCVSS not listedHigh severity
Scope

What the vendor says is affected

  • XenServer
  • These issues affect XenServer 8.4 and XenServer 9.
Next step

What the vendor recommends

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/en-us/xenserver/8/update or https://docs.xenserver.com/en-us/xenserver/9/update

Review the complete instructions on the vendor's site
Update history

What changed in later vendor updates

SecurityAlert records field-level changes from the point we begin following a bulletin. Earlier vendor changes may not have a field-by-field record.

    • The vendor changed its remediation guidance.
Timeline

When this advisory changed

  1. Published by Citrix

    The publication date reported by the vendor.

  2. Added to SecurityAlert

    We collected the advisory from the official source.

  3. Confirmed at the source

    Our collector saw this advisory during a later source check.

Vulnerabilities

CVEs named in this advisory

CVE-2026-42492View CVSS, KEV, EPSS, and threat contextCVE-2026-62428View CVSS, KEV, EPSS, and threat contextCVE-2026-62431View CVSS, KEV, EPSS, and threat contextCVE-2026-62432View CVSS, KEV, EPSS, and threat contextCVE-2026-62434View CVSS, KEV, EPSS, and threat contextCVE-2026-62435View CVSS, KEV, EPSS, and threat contextCVE-2026-62436View CVSS, KEV, EPSS, and threat context
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