Quick answers
- Is CVE-2026-61400 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-61400 being exploited in the wild.
- How severe is CVE-2026-61400?
- High severity, with a CVSS score of 8.8, published 21 August 2026.
- Which products and versions are affected?
- Apache Cloudstack 4.20.0.0 through 4.20.3.0, 4.21.0.0 through 4.22.1.0.
- Is there a fix for CVE-2026-61400?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-61400 attacked?
- It is attacked over the network, in a hosted service.
- Am I affected by CVE-2026-61400?
- 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
A command injection flaw exists in the getDiagnosticsData and runDiagnostics API endpoints within Apache CloudStack's diagnostics functionality for system VMs and virtual routers. The vulnerability stems from improper neutralization of special shell characters in user-supplied input passed to system commands. An authenticated user with Admin role permissions can exploit this to achieve remote code execution as root (or the diagnostics-process user) on affected system VMs and virtual routers. While the APIs are restricted to Admin accounts by default, a compromised or malicious administrator can leverage this to establish a foothold within the managed infrastructure and potentially access guest network traffic. Patched versions 4.20.3.1, 4.22.1.1, and later address this issue.
Affected products
- Apache CloudStack 4.20.0.0 through 4.20.3.0, 4.21.0.0 through 4.22.1.0
Timeline
- 2026-08-21: disclosed