Improper access control in Apache CloudStack - CVE-2026-25199
Published: May 12, 2026
Vulnerability identifier: #VU131156
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-25199
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Apache Foundation
Affected software:
Apache CloudStack
Apache CloudStack
Detailed vulnerability description
The vulnerability allows a remote user to gain full control over another account's virtual machine.
The vulnerability exists due to improper access control in the Proxmox extension when using the user-editable proxmox_vmid instance setting to associate CloudStack instances with Proxmox virtual machines. A remote user can modify the setting to reference a virtual machine belonging to another account to gain full control over another account's virtual machine.
Proxmox VM IDs are predictable, which helps exploitation.
How to mitigate CVE-2026-25199
Install security update from vendor's website.