RCE in Apache Cloudstack

CVE-2026-47359

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.

Vulnerability class: Command Injection (OS Command Injection)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.020 (80.4th percentile), scored .

Low probability of exploitation in the next 30 days, but still tracked. 80th percentile — 80.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-47359: rose from 0.011 to 0.020.

EPSS over last 30 days · oldest: 0.011 · newest: 0.020 · change: +0.009

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-47359?
CVE-2026-47359 is a high-severity vulnerability in Apache Cloudstack, classified under OS Command Injection. CVSS score: 8.8/10. Published 2026-08-21.
How severe is CVE-2026-47359?
High severity. CVSS v3 base score is 8.8 out of 10.