CVE-2025-66171

MediumCVSS 6.5

Published: 08/05/2026(UTC)Updated: 07/10/2026(UTC)Translated: 01/10/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.38%

30th percentile - higher than 30% of all known CVEs

Summary

The CloudStack Backup plugin has improper access logic in versions 4.21.0.0 and 4.22.0.0. Any authenticated user with access to specific APIs can create new VMs using backups of any other user.

Risk Assessment

Risk of unauthorized access to data and compromise of CloudStack environment integrity.

Recommendation

Upgrade to version 4.22.0.1, which fixes this issue.

Other vulnerabilities in CloudStack

CVE-2025-66170Medium
The CloudStack Backup plugin has improper authorization logic in versions 4.21.0.0 and 4.22.0.0. Any authenticated user with access to specific APIs can list backups from any account, but cannot see the contents.

Original NVD description (English source)

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 data from NVD (NIST) · CISA KEV · EPSS