PatchSiren cyber security CVE debrief

CVE-2026-62440 Apache Software Foundation CVE debrief

The CVE-2026-62440 record describes an 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 versions from 4.21.0.0 through 4.22.1.0. Users are recommended to upgrade to version 4.22.1.1 or later. The vulnerability has significant security implications for Kubernetes clusters managed by Apache CloudStack, particularly in multi-tenant environments. Affected deployments should be identified and prioritized for remediation. Security teams should review compensating controls and monitor for suspicious activity related to Kubernetes cluster manipulation.

Vendor: Apache Software Foundation
Product: Apache CloudStack
CVSS: Unknown
CISA KEV: Not listed in stored evidence
Original CVE published: 2026-08-21
Original CVE updated: 2026-08-21
Advisory published: 2026-08-21
Advisory updated: 2026-08-21

Who should care

Apache CloudStack users and administrators, Kubernetes cluster operators, security teams, and platform administrators should be aware of this vulnerability and take necessary actions to upgrade and secure their environments. Affected deployments should be identified and prioritized for remediation. Security teams should review compensating controls and monitor for suspicious activity related to Kubernetes cluster manipulation. Additionally, operators of Kubernetes clusters managed by Apache CloudStack should assess their exposure and implement mitigations as needed.

Technical summary

The CVE record describes an 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. The issue affects Apache CloudStack versions from 4.21.0.0 through 4.22.1.0. Users are recommended to upgrade to version 4.22.1.1 or later. This vulnerability has a significant impact on the security of Kubernetes clusters managed by Apache CloudStack, particularly in multi-tenant environments. Affected deployments should be identified and prioritized for remediation.

Defensive priority

Apache CloudStack users should prioritize upgrading to version 4.22.1.1 or later.

Recommended defensive actions

Upgrade to Apache CloudStack version 4.22.1.1 or later
Review and adjust Kubernetes cluster configurations
Monitor for suspicious activity
Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record indicates an Improper Access Control vulnerability in Apache CloudStack's Kubernetes Service (CKS) plugin. Affected versions are from 4.21.0.0 through 4.22.1.0. Users are recommended to upgrade to version 4.22.1.1 or later. Evidence is limited to the official CVE record and NVD detail. Defenders should verify affected product deployments, review official advisories, and plan vendor-supported updates or mitigations.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-08-21T09:16:39.963Z and has not been modified since then.