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.
INFO
Published Date :
2026-05-08T12:22:56.226Z
Last Modified :
2026-05-08T12:22:56.226Z
Source :
apache
AFFECTED PRODUCTS
The following products are affected by CVE-2026-25199 vulnerability.
| Vendors | Products |
|---|---|
| Apache |
|
REFERENCES
Here, you will find a curated list of external links that provide in-depth information to CVE-2026-25199.
