An authenticated tenant can register a template pointing to an attacker-controlled metalink file containing internal targets. The Secondary Storage VM will retrieve the data and persist it as a template file, which can later be downloaded through normal APIs.
RCE on KVM hypervisor via NFS, Metalink files with/without Direct Downloads:
An authenticated CloudStack tenant holding the default User role can execute arbitrary shell commands as root on the KVM hypervisor host that runs other tenants' VMs. This is cross-tenant root on the underlying compute, reachable via the public CloudStack API.
When a User registers a VM template with directDownload=true and a URL pointing to a .metalink file, the management server fetches the metalink XML and dispatches download to the KVM agent. Inner URLs inside the metalink XML are never re-validated against the scheme allowlist.
These issues affect Apache CloudStack: from 4.14.0.0 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.
Analysis and contextual insights are available on OpenCVE Cloud.
No vendor fix or workaround currently provided.
Additional remediation guidance may be available on OpenCVE Cloud.
Tracking
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Fri, 21 Aug 2026 14:30:00 +0000
| Type | Values Removed | Values Added |
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| Metrics |
cvssV3_1
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Fri, 21 Aug 2026 09:45:00 +0000
| Type | Values Removed | Values Added |
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| First Time appeared |
Apache
Apache cloudstack |
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| Vendors & Products |
Apache
Apache cloudstack |
Fri, 21 Aug 2026 08:45:00 +0000
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| Description | SSRF via Metalink Mirror URL Resolution: An authenticated tenant can register a template pointing to an attacker-controlled metalink file containing internal targets. The Secondary Storage VM will retrieve the data and persist it as a template file, which can later be downloaded through normal APIs. RCE on KVM hypervisor via NFS, Metalink files with/without Direct Downloads: An authenticated CloudStack tenant holding the default User role can execute arbitrary shell commands as root on the KVM hypervisor host that runs other tenants' VMs. This is cross-tenant root on the underlying compute, reachable via the public CloudStack API. When a User registers a VM template with directDownload=true and a URL pointing to a .metalink file, the management server fetches the metalink XML and dispatches download to the KVM agent. Inner URLs inside the metalink XML are never re-validated against the scheme allowlist. These issues affect Apache CloudStack: from 4.14.0.0 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. | |
| Title | Apache CloudStack: RCE and SSRF in direct download, metalink and NFS templates | |
| Weaknesses | CWE-78 CWE-918 |
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| References |
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Status: PUBLISHED
Assigner: apache
Published:
Updated: 2026-08-21T13:30:34.347Z
Reserved: 2026-06-03T15:48:58.143Z
Link: CVE-2026-50112
Updated: 2026-08-21T13:30:16.891Z
Status : Received
Published: 2026-08-21T09:16:38.150
Modified: 2026-08-21T14:16:50.423
Link: CVE-2026-50112
No data.
OpenCVE Enrichment
Updated: 2026-08-21T09:30:08Z