CVE-2026-25199: CWE-200 Exposure of Sensitive Information to an Unauthorized Actor in Apache Software Foundation Apache CloudStack
A vulnerability in Apache CloudStack versions 4. 21. 0. 0 through 4. 22. 0. 0 involving the Proxmox extension allows unauthorized users to access and control virtual machines belonging to other tenants. This occurs because the proxmox_vmid instance setting is user-editable and not validated against tenant ownership, enabling attackers to manipulate it to reference VMs of other accounts. The issue permits unauthorized cross-tenant access with full control capabilities such as starting, stopping, and destroying the targeted VM. An official fix is available in version 4.
AI Analysis
Technical Summary
The Apache CloudStack Proxmox extension improperly trusts a user-editable instance setting, proxmox_vmid, to link CloudStack instances with Proxmox VMs. Because this setting is neither restricted nor validated against tenant ownership and Proxmox VM IDs are predictable, a non-privileged attacker can modify this value to gain unauthorized access to VMs belonging to other tenants. This vulnerability affects Apache CloudStack versions 4.21.0.0 through 4.22.0.0. The attacker can exercise full control over the targeted VM, including starting, stopping, and destroying it. The issue is resolved in Apache CloudStack version 4.22.0.1. A temporary mitigation involves restricting user edits of the proxmox_vmid instance detail via global configuration.
Potential Impact
Unauthorized actors can gain cross-tenant access to virtual machines in affected Apache CloudStack deployments using the Proxmox extension. This exposure allows attackers to fully control other tenants' VMs, including operations such as starting, stopping, and destroying these VMs. Such unauthorized control can lead to data exposure, service disruption, and potential loss of tenant resources.
Mitigation Recommendations
Users should upgrade Apache CloudStack to version 4.22.0.1, which contains the official fix for this vulnerability. For existing installations where immediate upgrade is not possible, administrators can mitigate the risk by preventing users from editing the proxmox_vmid instance detail. This can be done by adding 'proxmox_vmid' to the global configuration parameter 'user.vm.denied.details'. No other actions are specified by the vendor advisory.
CVE-2026-25199: CWE-200 Exposure of Sensitive Information to an Unauthorized Actor in Apache Software Foundation Apache CloudStack
Description
A vulnerability in Apache CloudStack versions 4. 21. 0. 0 through 4. 22. 0. 0 involving the Proxmox extension allows unauthorized users to access and control virtual machines belonging to other tenants. This occurs because the proxmox_vmid instance setting is user-editable and not validated against tenant ownership, enabling attackers to manipulate it to reference VMs of other accounts. The issue permits unauthorized cross-tenant access with full control capabilities such as starting, stopping, and destroying the targeted VM. An official fix is available in version 4.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Apache CloudStack Proxmox extension improperly trusts a user-editable instance setting, proxmox_vmid, to link CloudStack instances with Proxmox VMs. Because this setting is neither restricted nor validated against tenant ownership and Proxmox VM IDs are predictable, a non-privileged attacker can modify this value to gain unauthorized access to VMs belonging to other tenants. This vulnerability affects Apache CloudStack versions 4.21.0.0 through 4.22.0.0. The attacker can exercise full control over the targeted VM, including starting, stopping, and destroying it. The issue is resolved in Apache CloudStack version 4.22.0.1. A temporary mitigation involves restricting user edits of the proxmox_vmid instance detail via global configuration.
Potential Impact
Unauthorized actors can gain cross-tenant access to virtual machines in affected Apache CloudStack deployments using the Proxmox extension. This exposure allows attackers to fully control other tenants' VMs, including operations such as starting, stopping, and destroying these VMs. Such unauthorized control can lead to data exposure, service disruption, and potential loss of tenant resources.
Mitigation Recommendations
Users should upgrade Apache CloudStack to version 4.22.0.1, which contains the official fix for this vulnerability. For existing installations where immediate upgrade is not possible, administrators can mitigate the risk by preventing users from editing the proxmox_vmid instance detail. This can be done by adding 'proxmox_vmid' to the global configuration parameter 'user.vm.denied.details'. No other actions are specified by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- apache
- Date Reserved
- 2026-01-30T04:45:03.322Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69fddc53cbff5d8610d55690
Added to database: 5/8/2026, 12:51:31 PM
Last enriched: 5/8/2026, 1:06:42 PM
Last updated: 5/8/2026, 2:08:33 PM
Views: 18
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