CVE-2025-66171CWE-359

CVE-2025-66171

Medium · published May 8, 2026

CVSS v3.1
6.5
EPSS
1%
Percentile
44.0
In the wild
Unconfirmed
What it is

The CloudStack Backup plugin has an improper access logic in versions 4.21.0.0 and 4.22.0.0. Anyone with authenticated user-account access in CloudStack 4.21.0.0+ environments, where this plugin is enabled and have access to specific APIs can create new VMs using backups of any other user of the environment.

Backup plugin users using CloudStack 4.21.0.0+ are recommended to upgrade to CloudStack version 4.22.0.1, which fixes this issue.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00530 · 44.0th percentile
Weakness
CWE-359 · Exposure of Private Personal Information to an Unauthorized Actor
Published
2026-05-08T17:16Z
Affected products (1)
ProductVersionsFixed in
apache/cloudstack≥ 4.21.0.0, < 4.22.0.14.22.0.1
References (2)
https://lists.apache.org/thread/n8mt5b7wkpysstb8w7rr9f02kc5cq2xm · [email protected]http://www.openwall.com/lists/oss-security/2026/05/09/2 · af854a3a-2127-422b-91ae-364da2661108
EPSS history
Timeline
  • 08 MAY 12:11Z
    Apache CloudStack: Any user can create a new VM from backups they should not have access to
    cvelistv5