# CVE-2025-66172: The CloudStack Backup plugin has an improper access logic in versions 4.21.0.0 and 4.22.0.0. Anyone with authenticated…

Source: https://junglewise.ai/threats/cve-2025-66172-the-cloudstack-backup-plugin-has-an-improper-access-logic-in  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-08. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2025-66172 · Severity: high · CVSS 8.1 · Published 2026-05-08

Apache CloudStack is an open-source platform used to manage and deploy large networks of virtual machines. A security flaw in its Backup plugin allows any logged-in user to access and restore data from other users' backups. This means an attacker could steal sensitive information by attaching another customer's backup volumes to their own virtual machines.

## Quick answers

**Is CVE-2025-66172 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-66172 being exploited in the wild.

**How severe is CVE-2025-66172?** High severity, with a CVSS score of 8.1, published 8 May 2026.

**Which products and versions are affected?** Apache CloudStack 4.21.0.0 through 4.22.0.0.

**Is there a fix for CVE-2025-66172?** A patch was published on 2026-05-08: Fix released in version 4.22.0.1 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2025-66172 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2025-66172?** Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An improper access control vulnerability (CWE-359) exists in the Apache CloudStack Backup plugin versions 4.21.0.0 and 4.22.0.0. The root cause is flawed access logic within the plugin's API handlers. An authenticated attacker with standard user-level access can invoke specific APIs to restore a volume from a backup belonging to a different user or account. Once restored, the attacker can attach this volume to a virtual machine under their control, leading to unauthorized data disclosure and integrity compromise. The issue is resolved in CloudStack version 4.22.0.1.

## Affected products

- Apache CloudStack 4.21.0.0 through 4.22.0.0

## Timeline

- 2026-05-08: disclosed: Initial disclosure by Apache Software Foundation
- 2026-05-08: advisory: NVD publication date
- 2026-05-08: patched: Fix released in version 4.22.0.1

## References

- [https://lists.apache.org/thread/n8mt5b7wkpysstb8w7rr9f02kc5cq2xm](https://lists.apache.org/thread/n8mt5b7wkpysstb8w7rr9f02kc5cq2xm)
- [http://www.openwall.com/lists/oss-security/2026/05/09/3](http://www.openwall.com/lists/oss-security/2026/05/09/3)