CVE-2026-18636

{
  "id": "CVE-2026-18636",
  "sourceIdentifier": "[email protected]",
  "published": "2026-08-11T15:17:28.760",
  "lastModified": "2026-10-23T19:10:00.167",
  "vulnStatus": "Awaiting Analysis",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The Velociraptor gRPC API has a VFSGetBuffer endpoint which allows reading files from the datastore. To prevent users from reading sensitive files or accessing other orgs, the requested path is prefix checked against a list of denied prefixes. This prefix check can be bypassed allowing a user to access usually denied files. If the user has read permission in the ROOT org, this allows access to other orgs, in which the user may not have permission."
    },
    {
      "lang": "es",
      "value": "La API gRPC de Velociraptor tiene un endpoint VFSGetBuffer que permite leer archivos del almacén de datos. Para evitar que los usuarios lean archivos sensibles o accedan a otras organizaciones, se verifica el prefijo de la ruta solicitada contra una lista de prefijos denegados. Esta verificación de prefijo puede ser eludida, permitiendo a un usuario acceder a archivos normalmente denegados. Si el usuario tiene permiso de lectura en la organización ROOT, esto permite el acceso a otras organizaciones en las que el usuario podría no tener permiso."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "Rapid7",
          "product": "Velociraptor",
          "defaultStatus": "unaffected",
          "repo": "https://github.com/Velocidex/velociraptor/",
          "versions": [
            {
              "version": "0",
              "lessThan": "0.77.2",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N",
          "baseScore": 6.8,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "HIGH",
          "userInteraction": "NONE",
          "scope": "CHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 2.3,
        "impactScore": 4.0
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-08-11T19:25:52.804927Z",
          "id": "CVE-2026-18636",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-288"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "http://docs.velociraptor.app/announcements/advisories/cve-2026-18636/",
      "source": "[email protected]"
    }
  ]
}