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CVE-2026-25199— Apache CloudStack: Proxmox Extension Allows Unauthorized Cross-Tenant Instance Access

EPSS 0.03% · P8
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I. Basic Information for CVE-2026-25199

Vulnerability Information
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Vulnerability Title
Apache CloudStack: Proxmox Extension Allows Unauthorized Cross-Tenant Instance Access
Source: NVD (National Vulnerability Database)
Vulnerability Description
Instances deployed via the Proxmox extension allow unauthorized access to instances belonging to other tenants. This issue affects Apache CloudStack: from 4.21.0.0 through 4.22.0.0. The Proxmox extension for CloudStack improperly uses a user-editable instance setting, proxmox_vmid, to associate CloudStack instances with Proxmox virtual machines. Because this value is not restricted or validated against tenant ownership and Proxmox VM IDs are predictable, a non-privileged attacker can modify the setting to reference a VM belonging to another account. This allows unauthorized cross-tenant access and enables full control over the targeted VM, including starting, stopping, and destroying the virtual machine. Users are recommended to upgrade to version 4.22.0.1, which fixes this issue. As a workaround for the existing installations, editing of the proxmox_vmid instance detail by users can be prevented by adding this detail name to the global configuration parameter - user.vm.denied.details.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
信息暴露
Source: NVD (National Vulnerability Database)
Vulnerability Title
Apache CloudStack 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache CloudStack是美国阿帕奇（Apache）基金会的一套基础架构即服务（IaaS）云计算平台。该平台主要用于部署和管理大型虚拟机网络。 Apache CloudStack 4.21.0.0版本至4.22.0.0版本存在信息泄露漏洞，该漏洞源于Proxmox扩展不当使用用户可编辑的实例设置proxmox_vmid，可能导致非特权攻击者修改设置引用其他租户的虚拟机，造成跨租户未授权访问。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
Apache Software FoundationApache CloudStack 4.21.0 ~ 4.22.0 -

II. Public POCs for CVE-2026-25199

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III. Intelligence Information for CVE-2026-25199

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Same Patch Batch · Apache Software Foundation · 2026-05-08 · 8 CVEs total

CVE-2025-664678.0 HIGHApache CloudStack: MinIO policy remains intact on bucket deletion
CVE-2025-692336.5 MEDIUMApache CloudStack: Domain/account resources limits not honored
CVE-2026-39816Apache NiFi: Missing Execute Code Required Permission on TinkerpopClientService
CVE-2026-25077Apache CloudStack: Unauthenticated Command Injection in Direct Download Templates
CVE-2025-66172Apache CloudStack: Any user can attach a volume in their VMs from backups they should not
CVE-2025-66171Apache CloudStack: Any user can create a new VM from backups they should not have access t
CVE-2025-66170Apache CloudStack: Any user can list backups that they should not have access to

IV. Related Vulnerabilities

Same product: Apache CloudStack
Same vendor: Apache Software Foundation
Same weakness: CWE-200

V. Comments for CVE-2026-25199

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