Apache CloudStack up to 4.20.3.0/4.22.1.0 NAS backup provider plugin os command injection

Summaryinfo

A vulnerability labeled as very critical has been found in Apache CloudStack up to 4.20.3.0/4.22.1.0. This issue affects some unknown processing of the component NAS backup provider plugin. The manipulation results in os command injection. This vulnerability was named CVE-2026-47359. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as very critical, was found in Apache CloudStack up to 4.20.3.0/4.22.1.0. Affected is an unknown part of the component NAS backup provider plugin. The manipulation with an unknown input leads to a os command injection vulnerability. CWE is classifying the issue as CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') vulnerability in Apache CloudStack's NAS backup provider plugin. The addBackupRepository API (available since 4.20.0.0) and updateBackupRepository API (introduced in 4.22.0.0) accept unsanitized command options for the backup repository. A malicious operator account can exploit this to inject arbitrary commands that execute on the KVM hypervisor host when any account subsequently performs a backup restore. This issue affects Apache CloudStack: from 4.20.0.0 through 4.20.3.0 and from 4.21.0.0 through 4.22.1.0. Users are recommended to upgrade to version 4.20.3.1 or 4.22.1.1 or later, which fixes the issue.

The advisory is shared for download at lists.apache.org. This vulnerability is traded as CVE-2026-47359 since 05/19/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Additional levels of successful authentication are necessary for exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 08/21/2026). The MITRE ATT&CK project declares the attack technique as T1202.

Upgrading to version 4.20.3.1 or 4.22.1.1 eliminates this vulnerability.

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Productinfo

Type

• Cloud Software

Vendor

• Apache

Name

• CloudStack

Version

• 4.20.0
• 4.20.1
• 4.20.2
• 4.20.3.0
• 4.22.0
• 4.22.1.0

License

• open-source

Website

• Vendor: https://www.apache.org/

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