{"id":"CVE-2026-50112","title":"SSRF via Metalink Mirror URL Resolution:\n\nAn authenticated tenant can register a template pointing to an attacker-controlled metalink file containing internal targets","summary":"SSRF via Metalink Mirror URL Resolution:\n\nAn 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 t…","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-78","CWE-918"],"vendor":"apache","product":"cloudstack","affected":["cloudstack >= 4.14.0.0, < 4.20.3.1","cloudstack >= 4.21.0.0, < 4.22.1.1"],"patched":["cloudstack 4.22.1.1"],"published":"2026-08-21","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:10:00.103","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-50112","references":[{"url":"https://lists.apache.org/thread/g6cwddtjrwbh1d56wjz4cfp3fzfm4kbc","label":"security@apache.org"}],"tags":["nvd"],"epss":0.00723,"epssPercentile":0.53793,"ingestedAt":"2026-10-27T18:52:09.887Z","slug":"CVE-2026-50112","body":"## Overview\n\nSSRF via Metalink Mirror URL Resolution:\n\nAn 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.\n\nRCE on KVM hypervisor via NFS, Metalink files with/without Direct Downloads:\n\nAn 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.\n\n\nWhen 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.\n\n\nThese 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.\n\nUsers are recommended to upgrade to version 4.20.3.1 or 4.22.1.1 or later, which fixes the issue.\n\n## Affected\n\n- `cloudstack >= 4.14.0.0, < 4.20.3.1`\n- `cloudstack >= 4.21.0.0, < 4.22.1.1`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `cloudstack 4.22.1.1`","depth":"twilight","depthScore":49,"depthScoreParts":{"impact":48.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}