CVE-2026-23561
vm-admin can mark a VM as storage domain causing host storage to be falsely unplugged.
Is CVE-2026-23561 being exploited?
Not confirmed. CVE-2026-23561 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.17% probability of exploitation in the next 30 days.
How severe is CVE-2026-23561?
CVE-2026-23561 is rated Critical with a CVSS score of 9.4. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-23561?
Yes. A fix has been recorded for CVE-2026-23561. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-23561 affect?
CVE-2026-23561 affects XAPI, XenServer, XCP-ng, Xen Cloud Platform, and 1 further product or version. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-23561?
Restrict vm-admin rights, avoid shutting untrusted VMs, isolate storage, apply vendor patch when released.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
A lower-privileged vm-admin can mark a VM as a host storage domain; shutting it down may mark PBD unplugged, causing storage disconnection, outages and potential data loss.
Immediate action required