{"id":"CVE-2025-66171","title":"The CloudStack Backup plugin has an improper access logic in versions 4.21.0.0 and 4.22.0.0","summary":"The CloudStack Backup plugin has an improper access logic in versions 4.21.0.0 and 4.22.0.0. Anyone with authenticated user-account access in CloudStack 4.21.0.0+ environments, where this plugin is enabled and have access to specific API…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","cwe":["CWE-359"],"vendor":"apache","product":"cloudstack","affected":["cloudstack >= 4.21.0.0, < 4.22.0.1"],"patched":["cloudstack 4.22.0.1"],"published":"2026-05-08","updated":"2026-09-30","sourceUpdated":"2026-09-30T22:10:00.273","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-66171","references":[{"url":"https://lists.apache.org/thread/n8mt5b7wkpysstb8w7rr9f02kc5cq2xm","label":"security@apache.org"},{"url":"http://www.openwall.com/lists/oss-security/2026/05/09/2","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.0053,"epssPercentile":0.42652,"ingestedAt":"2026-09-30T22:27:27.785Z","slug":"CVE-2025-66171","body":"## Overview\n\nThe CloudStack Backup plugin has an improper access logic in versions 4.21.0.0 and 4.22.0.0. Anyone with authenticated user-account access in CloudStack 4.21.0.0+ environments, where this plugin is enabled and have access to specific APIs can create new VMs using backups of any other user of the environment.\n\nBackup plugin users using CloudStack 4.21.0.0+ are recommended to upgrade to CloudStack version 4.22.0.1, which fixes this issue.\n\n## Affected\n\n- `cloudstack >= 4.21.0.0, < 4.22.0.1`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `cloudstack 4.22.0.1`","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}