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Citrix XenServer Vulnerability Allows Data Confidentiality Breach

Favicon for www.cert.ssi.gouv.fr CERT-FR Security Advisories
Published March 25th, 2026
Detected March 25th, 2026
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Summary

CERT-FR has issued an advisory regarding a vulnerability in Citrix XenServer (CVE-2026-4397) that could lead to a data confidentiality breach. The advisory affects XenServer versions 8.4 without the latest security patch and directs users to Citrix's security bulletin for remediation.

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What changed

CERT-FR has issued an advisory (CERTFR-2026-AVI-0358) concerning a critical vulnerability, CVE-2026-4397, discovered in Citrix XenServer. This vulnerability, present in version 8.4 if not updated with the latest security patch, allows attackers to compromise data confidentiality. The advisory urges affected organizations to consult Citrix's security bulletin CTX696397 for immediate patching instructions.

Organizations utilizing Citrix XenServer 8.4 must promptly apply the security updates provided by Citrix to mitigate the risk of data breaches. Failure to do so could result in unauthorized access to sensitive information, leading to potential regulatory scrutiny and reputational damage. The advisory emphasizes referencing the provided documentation for specific remediation steps and further details on the vulnerability.

What to do next

  1. Apply security patches for Citrix XenServer 8.4 as per vendor bulletin CTX696397
  2. Review system logs for any signs of exploitation

Source document (simplified)

Premier Ministre S.G.D.S.N

Agence nationale
de la sécurité des
systèmes d'information

Paris, le 25 mars 2026 N° CERTFR-2026-AVI-0358 Affaire suivie par: CERT-FR

Avis du CERT-FR

Objet: Vulnérabilité dans Citrix XenServer

Gestion du document

| Référence | CERTFR-2026-AVI-0358 |
| Titre | Vulnérabilité dans Citrix XenServer |
| Date de la première version | 25 mars 2026 |
| Date de la dernière version | 25 mars 2026 |
| Source(s) | Bulletin de sécurité Citrix CTX696397 du 25 mars 2026 |
Une gestion de version détaillée se trouve à la fin de ce document.

Risque

  • Atteinte à la confidentialité des données

Systèmes affectés

  • XenServer versions 8.4 sans le dernier correctif de sécurité

Résumé

Une vulnérabilité a été découverte dans Citrix XenServer. Elle permet à un attaquant de provoquer une atteinte à la confidentialité des données.

Solutions

Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).

Documentation

Gestion détaillée du document

  1. le 25 mars 2026 Version initiale

Named provisions

Risque Systèmes affectés Résumé Solutions Documentation

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Source

Favicon for www.cert.ssi.gouv.fr
CERT-FR Security Advisories cert.ssi.gouv.fr/avis
Data Privacy & Cybersecurity
Analysis generated by AI. Source diff and links are from the original.

Classification

Agency
CERT-FR
Published
March 25th, 2026
Instrument
Notice
Legal weight
Non-binding
Stage
Final
Change scope
Substantive
Document ID
CERTFR-2026-AVI-0358

Who this affects

Applies to
Technology companies
Industry sector
5112 Software & Technology
Activity scope
Vulnerability Management System Patching
Geographic scope
France FR

Taxonomy

Primary area
Cybersecurity
Operational domain
IT Security
Compliance frameworks
NIST CSF
Topics
Data Security Vulnerability Management

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