CVE-2026-61400

HIGH CVSS 3.1: 8.8 EPSS 1.54%
Updated Aug 27, 2026
Apache
Parameter Value
CVSS 8.8 (HIGH)
Affected Versions 4.20.0.0 — 4.22.1.1
Fixed In 4.20.3.1
Type CWE-77 (Command Injection)
Vendor Apache
Public PoC No

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 diagnostics-process user, at minimum). This represents a full compromise of the affected instance and, depending on network segmentation, may provide a foothold for lateral movement within the CloudStack-managed infrastructure, including access to guest network traffic handled by the compromised Virtual Router.

The getDiagnosticsData and runDiagnostics APIs are restricted to only Admin role accounts by default. This issue affects Apache CloudStack: from 4.20.0.0 through 4.20.3.0 and from 4.21.0.0 through 4.22.1.0. Users are recommended to upgrade to version 4.20.3.1 or 4.22.1.1 or later, which fixes the issue.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service

CVSS Vector v3.1

Weakness Type (CWE)

Vulnerable Products 2

Configuration From (including) Up to (excluding)
Apache Cloudstack
cpe:2.3:a:apache:cloudstack:*:*:*:*:*:*:*:*
4.20.0.0 4.20.3.1
Apache Cloudstack
cpe:2.3:a:apache:cloudstack:*:*:*:*:*:*:*:*
4.21.0.0 4.22.1.1