CloudStack Backup Plugin 4.21/4.22 Improper Access: Volume Restore
CVE-2025-66172 Published on May 8, 2026
Apache CloudStack: Any user can attach a volume in their VMs 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 restore a volume from any other user's backups and attach the volume to their own VMs.
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-2025-66172 is exploitable 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 and integrity, and no impact on 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-2025-66172 has been classified to as a Privacy violation vulnerability or weakness.
Products Associated with CVE-2025-66172
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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.