CVE-2026-25199— Apache CloudStack: Proxmox Extension Allows Unauthorized Cross-Tenant Instance Access
Quick assessment
Affected
Apache Software Foundation Apache CloudStack
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
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。
Possible ATT&CK Techniques 1 AI
T1136.001 · Local AccountAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Apache Software Foundation | Apache CloudStack | 4.21.0≤ 4.22.0 |
affected |
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
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
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Apache Software Foundation | Apache CloudStack | 4.21.0 ~ 4.22.0 | - |
|
II. Public POCs for CVE-2026-25199
| # | POC Description | Source Link | Shenlong Link |
|---|
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Mailing List Discussions for CVE-2026-25199 (1)
Same Patch Batch · Apache Software Foundation · 2026-05-08 · 8 CVEs total
| CVE-2025-66467 | 8.0 HIGH | Apache CloudStack: MinIO policy remains intact on bucket deletion |
| CVE-2025-69233 | 6.5 MEDIUM | Apache CloudStack: Domain/account resources limits not honored |
| CVE-2025-66170 | Apache CloudStack: Any user can list backups that they should not have access to | |
| CVE-2025-66171 | Apache CloudStack: Any user can create a new VM from backups they should not have access t | |
| CVE-2025-66172 | Apache CloudStack: Any user can attach a volume in their VMs from backups they should not | |
| CVE-2026-25077 | Apache CloudStack: Unauthenticated Command Injection in Direct Download Templates | |
| CVE-2026-39816 | Apache NiFi: Missing Execute Code Required Permission on TinkerpopClientService |
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