{"id":"CVE-2026-25199","summary":"Apache CloudStack: Proxmox Extension Allows Unauthorized Cross-Tenant Instance Access","details":"Instances deployed via the Proxmox extension allow unauthorized access to instances belonging to other tenants.\n\n\n\n\nThis issue affects Apache CloudStack: from 4.21.0.0 through 4.22.0.0.\n\n\n\n\nThe Proxmox extension for CloudStack improperly uses a user-editable instance setting, proxmox_vmid, to associate CloudStack instances with Proxmox virtual machines. Because this value is not restricted or validated against tenant ownership and Proxmox VM IDs are predictable, a non-privileged attacker can modify the setting to reference a VM belonging to another account. This allows unauthorized cross-tenant access and enables full control over the targeted VM, including starting, stopping, and destroying the virtual machine.\n\n\n\n\nUsers are recommended to upgrade to version 4.22.0.1, which fixes this issue.\n\n\n\n\nAs a workaround for the existing installations, editing of the proxmox_vmid instance detail by users can be prevented by adding this detail name to the global configuration parameter - user.vm.denied.details.","modified":"2026-07-08T07:32:25.792295443Z","published":"2026-05-08T12:22:56.226Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25199.json","unresolved_ranges":[{"extracted_events":[{"introduced":"4.21.0"},{"last_affected":"4.22.0"}],"source":"AFFECTED_FIELD"},{"extracted_events":[{"introduced":"4.21.0.0"},{"fixed":"4.22.0.0"}],"source":"DESCRIPTION"}],"cna_assigner":"apache","cwe_ids":["CWE-200"]},"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/05/09/7"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25199.json"},{"type":"ADVISORY","url":"https://lists.apache.org/thread/n8mt5b7wkpysstb8w7rr9f02kc5cq2xm"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-25199"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/apache/cloudstack","events":[{"introduced":"f9513b47bf8cda46c2cee7e31d4d662346bc7399"},{"fixed":"71f47d61304d1a05627bc335c8d35d7ef1040fe1"}],"database_specific":{"source":"DESCRIPTION","extracted_events":[{"introduced":"4.21.0.0"},{"fixed":"4.22.0.0"}]}}],"versions":["4.21.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-25199.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"}]}