Citrix XenServer Multiple Vulnerabilities
CSIRTS triage
- What
- Multiple vulnerabilities exist in Citrix XenServer.
- Who is affected
- Users of Citrix XenServer are affected.
- Urgency
- Remediation is not urgent as there are no known exploits for these vulnerabilities.
- Action
- Check for updates and apply patches when available.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://www.hkcert.org/security-bulletin/citrix-xenserver-multiple-vulnerabilities_20260730
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-2026-624310.38% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 30% 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-2026-624340.33% 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-2026-624350.19% 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-2026-624360.19% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 10% 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-2026-62431 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-62432 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-62434 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-62435 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-62436 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- high[NEW] [high] Xen: Multiple vulnerabilitiescert-bund
- unknownXen Multiple Vulnerabilitieshkcert
- unknownMultiple Vulnerabilities in Xen (July 29, 2026)cert-fr-avis
- unknownMultiple Vulnerabilities in Citrix XenServer (July 29, 2026)cert-fr-avis
- mediumCVE-2026-62436: [This CNA information record relates to multiple CVEs; the text explains which aspects/vulnera…nvd
- mediumCVE-2026-62435: [This CNA information record relates to multiple CVEs; the text explains which aspects/vulnera…nvd
- mediumCVE-2026-62434: A guest started with Populated on Demand enabled (PoD) can attempt to reclaim pages which aren…nvd
- highCVE-2026-62432: The EVTCHNOP_expand_array hypercall checks for whether FIFO event channels are enabled, but wi…nvd
- highCVE-2026-62431: The logic to handle periodic Viridian STIMERs performs a division with an unchecked user-contr…nvd
- highCVE-2026-62428: When grant-copy operations are processed, the respective grant may or may not already be in us…nvd
- highCVE-2026-42492: Xenstore, to have an up-to-date picture of the entire system, wants to know of domains appeari…nvd
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