CVE-2026-61400: Improper Neutralization of Special Elements used in a Command ('Command Injection') vulnerability in Apache Cl

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HIGH 8.8WATCHLISTUPGRADE

CVE-2026-61400 is a high-severity flaw (CVSS 8.8) affecting cloudstack. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improper Neutralization of Special Elements used in a Command ('Command Injection') vulnerability in Apache CloudStack's run and get diagnostics functionality for the system VMs and virtual routers. An authenticated user holding the permissions required to invoke either `getDiagnosticsData` or `runDiagnostics` can achieve arbitrary command execution on the system VM and/or Virtual Router instances, with commands running as root (or as the diagno

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	2.9% (top 13%)
CISA exploited list	No
Weakness	CWE-77
Published	2026-08-21
Last modified	2026-10-16

Publisher (CNA): Apache Software Foundation · Vendor: apache

Last updated 2026-10-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-21 09:16 UTCPublished CVE record published
2026-10-16 15:10 UTCUpdated Record last modified

apache cloudstack UPGRADE

Affected: >= 4.20.0.0 and < 4.20.3.1 · >= 4.21.0.0 and < 4.22.1.1

Fixed in: 4.20.3.1, 4.22.1.1

Safe to downgrade to: a release before 4.20.0.0

1. Check installed version

apt-cache policy cloudstack || rpm -q cloudstack || cloudstack --version

2. UPGRADE to 4.20.3.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade cloudstack

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade cloudstack

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 4.20.0.0 (Debian / Ubuntu)

apt-cache madison cloudstack sudo apt install cloudstack=<VERSION_BEFORE_4.20.0.0> sudo apt-mark hold cloudstack

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list cloudstack sudo dnf downgrade cloudstack-<VERSION_BEFORE_4.20.0.0> sudo dnf versionlock add cloudstack

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

Fedora ELN · openbao · FIXED · 2.6.5-1.eln159 · FEDORA-2026-77adf886ae · source

sudo dnf upgrade --advisory=FEDORA-2026-77adf886ae

Fedora 46 · sugar-turtleart · FIXED · 220-16.fc46 · FEDORA-2026-b79483c788 · source

sudo dnf upgrade --advisory=FEDORA-2026-b79483c788

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-61400?

cloudstack: upgrade to 4.20.3.1, 4.22.1.1. Exact commands for each OS are on this page.

Is CVE-2026-61400 being exploited?

CVE-2026-61400 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-61400 affect?

CVE-2026-61400 affects cloudstack. Severity is high (CVSS 8.8). Improper Neutralization of Special Elements used in a Command ('Command Injection') vulnerability in Apache CloudStack's run and get diagnostics functionality for the system VMs and virtual routers. An authenticated user holding the permis

How urgent is CVE-2026-61400?

Priority 58/100. High severity; On your watchlist

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References

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