{"id":"CVE-2025-66172","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":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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-2025-66172","references":[{"url":"https://lists.apache.org/thread/n8mt5b7wkpysstb8w7rr9f02kc5cq2xm","label":"security@apache.org"},{"url":"http://www.openwall.com/lists/oss-security/2026/05/09/3","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.00512,"epssPercentile":0.41429,"ingestedAt":"2026-09-30T22:27:27.785Z","slug":"CVE-2025-66172","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 restore a volume from any other user's backups and attach the volume to their own VMs.\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":"twilight","depthScore":45,"depthScoreParts":{"impact":44.6,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}