Multiple Vulnerabilities in Citrix XenServer (July 29, 2026)

unknownCVE-2026-42492 CVE-2026-62428 CVE-2026-62436 CVE-2026-62434 CVE-2026-62432 CVE-2026-62435

Multiple vulnerabilities have been discovered in Citrix XenServer. Some of them allow an attacker to cause remote arbitrary code execution, remote denial of service, and an unspecified security issue by the vendor.

CSIRTS triage

vendor: Citrix product: XenServer Remote code execution Denial of serviceOther

What: Multiple vulnerabilities allow remote arbitrary code execution and denial of service.
Who is affected: Deployments of Citrix XenServer are affected.
Urgency: Remediation is urgent due to the potential for remote code execution and denial of service.
Action: Apply patches as they become available.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: CERT-FR Avis de sécurité (FR · national-cert · site)
Severity: unknown
Published: 2026-07-29
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-0941/

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-424920.48% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 39% of all scored CVEs.
Low exploitation riskCVE-2026-624280.10% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 1% of all scored CVEs.
Low exploitation riskCVE-2026-624360.19% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 10% of all scored CVEs.
Low exploitation riskCVE-2026-624340.33% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 25% of all scored CVEs.
Low exploitation riskCVE-2026-624320.21% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 12% of all scored CVEs.
Low exploitation riskCVE-2026-624350.19% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 10% of all scored CVEs.
Low exploitation riskCVE-2026-624310.38% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 30% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-42492	coverage & exploitation status	NVD · CVE.org
CVE-2026-62428	coverage & exploitation status	NVD · CVE.org
CVE-2026-62436	coverage & exploitation status	NVD · CVE.org
CVE-2026-62434	coverage & exploitation status	NVD · CVE.org
CVE-2026-62432	coverage & exploitation status	NVD · CVE.org
CVE-2026-62435	coverage & exploitation status	NVD · CVE.org
CVE-2026-62431	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Citrix XenServer

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

high[UPDATE] [high] Xen and Citrix Systems XenServer: Multiple vulnerabilitiescert-bund · 2026-07-30
unknownCitrix XenServer Multiple Vulnerabilitieshkcert · 2026-07-30