CVE-2026-63300

{
  "id": "CVE-2026-63300",
  "sourceIdentifier": "[email protected]",
  "published": "2026-08-12T20:17:47.953",
  "lastModified": "2026-10-24T16:10:00.153",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "An improper validation vulnerability in the instancePostMigration function in lxd/instance_post.go of LXD allows an authenticated attacker with can_create_instances permissions on a restricted project to bypass project-level security restrictions. When migrating an instance between projects, LXD fails to validate the instance's configuration against the target project's enforced restrictions (such as restricted.containers.lowlevel, restricted.devices.*, and restricted.networks.access). An attacker can exploit this by creating a disallowed or high-privilege instance in an unrestricted project and subsequently moving it into the restricted project."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad de validación incorrecta en la función instancePostMigration en lxd/instance_post.go de LXD permite a un atacante autenticado con permisos de can_create_instances en un proyecto restringido eludir las restricciones de seguridad a nivel de proyecto. Al migrar una instancia entre proyectos, LXD no valida la configuración de la instancia contra las restricciones impuestas por el proyecto de destino (como restricted.containers.lowlevel, restricted.devices.* y restricted.networks.access). Un atacante puede explotar esto creyo una instancia no permitida o de alto privilegio en un proyecto no restringido y posteriormente moviéndola al proyecto restringido."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "Canonical",
          "product": "LXD",
          "defaultStatus": "unaffected",
          "packageName": "LXD",
          "platforms": [
            "Linux"
          ],
          "repo": "https://github.com/canonical/lxd",
          "versions": [
            {
              "version": "5.0.0",
              "lessThan": "5.0.8",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "5.21.0",
              "lessThan": "5.21.6",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "6.0",
              "lessThan": "6.10",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
          "baseScore": 9.9,
          "baseSeverity": "CRITICAL",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "CHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.1,
        "impactScore": 6.0
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-08-13T03:55:57.925616Z",
          "id": "CVE-2026-63300",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-862"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:canonical:lxd:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "5.0.0",
              "versionEndExcluding": "5.0.8",
              "matchCriteriaId": "59D070D6-84D2-400E-8260-EA52E5C60D37"
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  "references": [
    {
      "url": "https://github.com/canonical/lxd/pull/18605",
      "source": "[email protected]",
      "tags": [
        "Exploit",
        "Patch"
      ]
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      "url": "https://github.com/canonical/lxd/pull/18651",
      "source": "[email protected]",
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    },
    {
      "url": "https://github.com/canonical/lxd/security/advisories/GHSA-5g5r-wh97-qcq2",
      "source": "[email protected]",
      "tags": [
        "Vendor Advisory",
        "Exploit",
        "Mitigation"
      ]
    }
  ]
}