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CVE-2026-62440: Improper Access Control vulnerability in Apache CloudStack's Kubernetes Service (CKS) plugin, allowing cross-t

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CRITICAL 9.1REMOTEWATCHLISTUPGRADE

CVE-2026-62440 is a critical-severity flaw (CVSS 9.1) affecting cloudstack. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improper Access Control vulnerability in Apache CloudStack's Kubernetes Service (CKS) plugin, allowing cross-tenant manipulation of the Kubernetes cluster while adding and removing nodes. This issue affects Apache CloudStack: from 4.21.0.0 through 4.22.1.0. Users are recommended to upgrade to version 4.22.1.1 or later, which fixes the issue.

Why this priority

  • Critical severity
  • Remotely exploitable, no login, no user action
  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score9.1 (Critical)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance0.5% (top 55%)
CISA exploited listNo
WeaknessCWE-284
Published2026-08-21
Last modified2026-10-16
Publisher (CNA): Apache Software Foundation · Vendor: apache

Share: LinkedIn · X · Reddit

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

Am I affected?

Timeline

apache cloudstack UPGRADE
Affected: >= 4.21.0.0 and < 4.22.1.1
Fixed in: 4.22.1.1
Safe to downgrade to: a release before 4.21.0.0
1. Check installed version
apt-cache policy cloudstack || rpm -q cloudstack || cloudstack --version
2. UPGRADE to 4.22.1.1 (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 4.21.0.0 (Debian / Ubuntu)
apt-cache madison cloudstack sudo apt install cloudstack=<VERSION_BEFORE_4.21.0.0> 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_4.21.0.0> 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.
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-2026-62440?

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

Is CVE-2026-62440 being exploited?

CVE-2026-62440 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-2026-62440 affect?

CVE-2026-62440 affects cloudstack. Severity is critical (CVSS 9.1). Improper Access Control vulnerability in Apache CloudStack's Kubernetes Service (CKS) plugin, allowing cross-tenant manipulation of the Kubernetes cluster while adding and removing nodes. This issue affects Apache CloudStack: from 4.21.0.0

How urgent is CVE-2026-62440?

Priority 53/100. Critical severity; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Kubernetes vulnerabilities

Related CVEs

References

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