CVE-2026-110111

Xen Orchestra before 6.9.0 Privilege Escalation via Prototype Pollution in vm.importFromEsxi

State: Published
Severity: 7.7 High
Published: Oct 13, 2026
Updated: Oct 26, 2026
Reserved: Oct 13, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	7.7 High	CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N	VulnCheck
3.1	7.5 High	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H	VulnCheck

Weaknesses

CWE-1321 Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

Affected Products

Product	Versions
xen-orchestravatesfr	before 6.9.0Affected 6.9.0Not affected

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.importFromEsxithird-party-advisory

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