Quick answers
- Is CVE-2026-62440 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-62440 being exploited in the wild.
- How severe is CVE-2026-62440?
- Critical severity, with a CVSS score of 9.1, published 21 August 2026.
- Which products and versions are affected?
- Apache Cloudstack 4.21.0.0 through 4.22.1.0.
- Is there a fix for CVE-2026-62440?
- A patch was published on 2026-08-21: Fix available in version 4.22.1.1 and later Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-62440 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-62440?
- Check whether you run Apache Cloudstack at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
This is an improper access control vulnerability (CWE-284) in the Kubernetes Service plugin of Apache CloudStack that fails to properly enforce tenant isolation when modifying cluster node membership. The vulnerability is exploitable when adding or removing nodes to/from a Kubernetes cluster, allowing an authenticated or cross-tenant attacker to manipulate clusters belonging to other tenants. The root cause lies in insufficient authorization checks in the node management API endpoints within the CKS plugin. Affected versions range from 4.21.0.0 through 4.22.1.0; the fix is available in version 4.22.1.1 and later. No active exploitation in the wild has been reported at this time.
Affected products
- Apache CloudStack 4.21.0.0 through 4.22.1.0
Timeline
- 2026-08-21: disclosed
- 2026-08-21: patched: Fix available in version 4.22.1.1 and later