{"api_version":"1","generated_at":"2026-05-09T11:16:35+00:00","cve":"CVE-2026-25199","urls":{"html":"https://cve.report/CVE-2026-25199","api":"https://cve.report/api/cve/CVE-2026-25199.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-25199","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-25199"},"summary":{"title":"Apache CloudStack: Proxmox Extension Allows Unauthorized Cross-Tenant Instance Access","description":"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.","state":"PUBLISHED","assigner":"apache","published_at":"2026-05-08 13:16:36","updated_at":"2026-05-09 07:16:09"},"problem_types":["CWE-200","CWE-200 CWE-200 Exposure of Sensitive Information to an Unauthorized 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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, 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."}],"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":{"dateUpdated":"2026-05-08T12:22:56.226Z","orgId":"f0158376-9dc2-43b6-827c-5f631a4d8d09","shortName":"apache"},"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"}}},"cveMetadata":{"assignerOrgId":"f0158376-9dc2-43b6-827c-5f631a4d8d09","assignerShortName":"apache","cveId":"CVE-2026-25199","datePublished":"2026-05-08T12:22:56.226Z","dateReserved":"2026-01-30T04:45:03.322Z","dateUpdated":"2026-05-09T06:43:07.020Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-08 13:16:36","lastModifiedDate":"2026-05-09 07:16:09","problem_types":["CWE-200","CWE-200 CWE-200 Exposure of Sensitive Information to an Unauthorized Actor"],"metrics":{"cvssMetricV31":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","baseScore":9.1,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"NONE"},"exploitabilityScore":3.9,"impactScore":5.2}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:apache:cloudstack:*:*:*:*:*:*:*:*","versionStartIncluding":"4.21.0.0","versionEndExcluding":"4.22.0.1","matchCriteriaId":"78690ED1-C4B3-4DC9-9B53-FB31D6D17125"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"25199","Ordinal":"1","Title":"Apache CloudStack: Proxmox Extension Allows Unauthorized Cross-T","CVE":"CVE-2026-25199","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"25199","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"Apache CloudStack: Proxmox Extension Allows Unauthorized Cross-T"}]}}}