Apache CloudStack Plugin: Improper Access 4.21.0.0-4.22.0.0 Allows VM Creation
CVE-2025-66171 Published on May 8, 2026
Apache CloudStack: Any user can create a new VM from backups they should not have access to
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.
Vulnerability Analysis
CVE-2025-66171 can be exploited with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity and availability.
Weakness Type
What is a Privacy violation Vulnerability?
The product does not properly prevent a person's private, personal information from being accessed by actors who either (1) are not explicitly authorized to access the information or (2) do not have the implicit consent of the person about whom the information is collected.
CVE-2025-66171 has been classified to as a Privacy violation vulnerability or weakness.
Products Associated with CVE-2025-66171
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Affected Versions
Apache Software Foundation Apache CloudStack:- Version 4.21.0.0, <= 4.22.0.0 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.