CVE-2026-18639

{
  "id": "CVE-2026-18639",
  "sourceIdentifier": "[email protected]",
  "published": "2026-08-11T16:17:30.590",
  "lastModified": "2026-10-23T19:10:00.167",
  "vulnStatus": "Awaiting Analysis",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "When Velociraptor is configured to use an OIDC IdP for authentication, it uses the email claim as a username. However, some IdP allow users to change the email claim without verification. Some IdPs do not set the \"email_verified\" claim and do not actually verify the email.\n\nThis allows a user to impersonate another user by setting their email address within the IdP, allowing account takeover."
    },
    {
      "lang": "es",
      "value": "Cuyo Velociraptor está configurado para usar un IdP OIDC para autenticación, utiliza la declaración de correo electrónico como nombre de usuario. Sin embargo, algunos IdP permiten a los usuarios cambiar la declaración de correo electrónico sin verificación. Algunos IdP no establecen la declaración ’email_verified’ y en realidad no verifican el correo electrónico.\n\nEsto permite a un usuario suplantar a otro usuario al establecer su dirección de correo electrónico dentro del IdP, lo que permite la toma de control de la cuenta."
    }
  ],
  "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:L/UI:R/S:U/C:H/I:H/A:N",
          "baseScore": 7.3,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "REQUIRED",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 2.1,
        "impactScore": 5.2
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-08-11T17:13:54.338948Z",
          "id": "CVE-2026-18639",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-290"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "http://docs.velociraptor.app/announcements/advisories/cve-2026-18639/",
      "source": "[email protected]"
    }
  ]
}