Ref# ADV2026_46 | Date: Feb 1st 2026

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Citrix published a security advisory highlighting vulnerabilities in the following product on January 27, 2026. It is recommended that you take the necessary precautions by ensuring your product is always updated. 

• XenServer – version 8.4 

For more information on this update, you can follow these URLs: 

• Citrix Security Advisory – CTX695997 

• Citrix Security Advisories 

The Guyana National CIRT recommends that users and administrators review this update and apply it where necessary. 

PDF Download: Citrix Security Advisory

References 

• Citrix Security Advisory (January 27th, 2026). Retrieved from Citrix. https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX695997&articleURL=XenServer_Security_Update_for_CVE_2025_58151_and_CVE_2026_23553 

• Citrix Security Advisory (January 27th, 2026). Retrieved from Canadian Centre for Cyber Security. https://www.cyber.gc.ca/en/alerts-advisories/citrix-security-advisory-av25-067