CVE WatchAug 21, 2026

CVE-2026-50112

SSRF via Metalink Mirror URL Resolution: An authenticated tenant can register a template pointing to an attacker-controlled metalink file c

CVSS

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No CVSS

EPSS

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KEV

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Exploit Today

0-100

Published: Aug 21, 2026 · Last modified: Aug 21, 2026 · CWE-78 · CWE-918

EPSS · 30d

Not enough EPSS history yet.

Technical 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.

Official references

lists.apache.orghttps://lists.apache.org/thread/g6cwddtjrwbh1d56wjz4cfp3fzfm4kbc

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CVECVSSEPSSKEVRExploitTitleMod.

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