Citrix security advisory (AV26-400)

Serial number: AV26-400
Date: April 28, 2026

On April 28, 2026, Citrix published a security advisory to address vulnerabilities in the following product:

• XenServer – versions prior to 8.4

The Cyber Centre encourages users and administrators to review the provided web links and perform the suggested mitigations.

• XenServer Security Update for Multiple Issues
• Citrix Security Advisories