CVE-2026-23556

highcovered by 2 sourcesfirst seen 2026-07-09

An attacker can exploit multiple vulnerabilities in Xen and Citrix Systems XenServer to escalate privileges, bypass security measures, modify and disclose data, or cause a denial-of-service condition.

CSIRTS triage

What: Multiple vulnerabilities can escalate privileges, bypass security measures, modify and disclose data, or cause denial of service.
Who is affected: Users of Xen and Citrix Systems XenServer.
Urgency: Remediation is urgent due to the high severity of the vulnerabilities.
Action: Apply the latest security updates for XenServer.

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Advisory coverage (2)

high[UPDATE] [high] Xen and Citrix Systems XenServer: Multiple vulnerabilitiescert-bund · 2026-07-10
unknownCVE-2026-23556: When oxenstored is tearing a domain down, the node data is cleaned up but the usage counts are…nvd · 2026-07-09

External references

NVD record for CVE-2026-23556

CVE.org record

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