Vulnerability · Published Oct 13, 2026 · Assigned by VulnCheck

CVE-2026-110111Xen Orchestra before 6.9.0 Privilege Escalation via Prototype Pollution in vm.importFromEsxi

High 7.5

In plain English

A high-severity prototype pollution in xen-orchestra from vatesfr. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities).

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.6%top 50.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Ubuntu:22.04:LTS	xen	no fix listed	UBUNTU-CVE-2026-110111
Ubuntu:24.04:LTS	xen	no fix listed	UBUNTU-CVE-2026-110111
Ubuntu:26.04:LTS	xen	no fix listed	UBUNTU-CVE-2026-110111
Ubuntu:26.10	xen	no fix listed	UBUNTU-CVE-2026-110111

Affected products (as reported)

Vendor	Product	Versions
vatesfr	xen-orchestra	0 – before 6.9.0

Weakness: CWE-1321 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

References

GitHub Security Advisory (GHSA-mc4m-hc98-rhmv) vendor-advisory
VulnCheck Advisory: Xen Orchestra before 6.9.0 Privilege Escalation via Prototype Pollution in vm.importFromEsxi third-party-advisory