{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-25199", "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "state": "PUBLISHED", "assignerShortName": "apache", "dateReserved": "2026-01-30T04:45:03.322Z", "datePublished": "2026-05-08T12:22:56.226Z", "dateUpdated": "2026-05-08T12:22:56.226Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "product": "Apache CloudStack", "vendor": "Apache Software Foundation", "versions": [{"lessThanOrEqual": "4.22.0", "status": "affected", "version": "4.21.0", "versionType": "semver"}]}], "credits": [{"lang": "en", "type": "reporter", "value": "Sander Grendelman <sander.grendelman@axians.com>"}], "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<div>Instances deployed via the Proxmox extension allow unauthorized access to instances belonging to other tenants.</div><div><br></div><div>This issue affects Apache CloudStack: from 4.21.0.0 through 4.22.0.0.</div><div><br></div><div>The Proxmox extension for CloudStack improperly uses a user-editable instance setting, <code>proxmox_vmid</code>, 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.</div><div><br></div><div>Users are recommended to upgrade to version 4.22.0.1, which fixes this issue.</div><div><br></div><div>As a workaround for the existing installations,&nbsp;editing of the <code>proxmox_vmid</code> instance detail by users can be prevented by adding this detail name to the global configuration parameter <code>- user.vm.denied.details</code>.</div>"}], "value": "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,\u00a0editing 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."}], "metrics": [{"other": {"content": {"text": "moderate"}, "type": "Textual description of severity"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-200", "description": "CWE-200 Exposure of Sensitive Information to an Unauthorized Actor", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "shortName": "apache", "dateUpdated": "2026-05-08T12:22:56.226Z"}, "references": [{"tags": ["vendor-advisory"], "url": "https://lists.apache.org/thread/n8mt5b7wkpysstb8w7rr9f02kc5cq2xm"}], "source": {"discovery": "EXTERNAL"}, "title": "Apache CloudStack: Proxmox Extension Allows Unauthorized Cross-Tenant Instance Access", "x_generator": {"engine": "Vulnogram 0.2.0"}}}}

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{"cveTags": [], "descriptions": [{"lang": "en", "value": "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,\u00a0editing 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."}], "id": "CVE-2026-25199", "lastModified": "2026-05-08T13:16:36.273", "metrics": {}, "published": "2026-05-08T13:16:36.273", "references": [{"source": "security@apache.org", "url": "https://lists.apache.org/thread/n8mt5b7wkpysstb8w7rr9f02kc5cq2xm"}], "sourceIdentifier": "security@apache.org", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-200"}], "source": "security@apache.org", "type": "Primary"}]}

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