CVE-2026-110111: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in vatesfr xen-orchestra
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.
CVSS v4.0
Score 7.7high
Affected software
vatesfr
xen-orchestra
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Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-10-13T16:22:43.091Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ace84a52cdf04f6569f0b21
Added to database: 10/13/2026, 19:21:09 UTC
Last updated: 10/13/2026, 19:35:56 UTC
Views: 1
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