Prototype Pollution in Vatesfr Xen-Orchestra
CVE-2026-110111
Xen Orchestra before 6.9.0 contains an improper access control vulnerability that allows any authenticated user to become global administrator by abusing the unprotected vm.importFromEsxi and vm.importMultipleFromEsxi methods. Attackers can point xo-server at a malicious ESXi host serving a crafted .vmx file with __proto__.permission set, polluting Object.prototype so permission-less accounts inherit admin rights and enabling remote code execution.
Vulnerability class: Prototype Pollution
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/vatesfr/xen-orchestra/security/advisories/GHSA-mc4m-hc98-rhmv (vendor-advisory)
- www.vulncheck.com/advisories/xen-orchestra-before-6.9.0-privilege-escalation-vi… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-110111?
- CVE-2026-110111 is a high-severity vulnerability in Vatesfr Xen-Orchestra, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 7.5/10. Published 2026-10-13.
- How severe is CVE-2026-110111?
- High severity. CVSS v3 base score is 7.5 out of 10.