Apache CloudStack Backup Plugin Improper Auth (4.21.0.0-4.22.0.0)
CVE-2025-66170 Published on May 8, 2026
Apache CloudStack: Any user can list backups that they should not have access to
The CloudStack Backup plugin has an improper authorization 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 has access to specific APIs can list backups from any account in the environment. This vulnerability does not allow them to see the contents of the backup.
Users are recommended to upgrade to version 4.22.0.1, which fixes the issue.
Vulnerability Analysis
CVE-2025-66170 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, with no impact on integrity and availability.
Weakness Type
What is an AuthZ Vulnerability?
The software performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions.
CVE-2025-66170 has been classified to as an AuthZ vulnerability or weakness.
Products Associated with CVE-2025-66170
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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.