CVE-2026-71291

{
  "id": "CVE-2026-71291",
  "sourceIdentifier": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c",
  "published": "2026-08-05T13:24:53.820",
  "lastModified": "2026-10-23T21:10:00.157",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Bolt CMS renders content field values through Twig's full application-level Environment with no SandboxExtension registered anywhere in the codebase. In src/Entity/Field.php, getTwigValue calls shouldBeRenderedAsTwig, which gates rendering only on the field definition's allow_twig flag and a regex checking for , , or ; when true, the raw field value is compiled and rendered via with no sandboxing."
    },
    {
      "lang": "es",
      "value": "Bolt CMS renderiza los valores de los campos de contenido a través del entorno completo a nivel de aplicación de Twig sin ninguna SandboxExtension registrada en ninguna parte del código base. En src/Entity/Field.php, getTwigValue() llama a shouldBeRenderedAsTwig(), que restringe la renderización solo al indicador allow_twig de la definición del campo y a una expresión regular que verifica ’{{’, ’{%’ o ’{#’; cuando es verdadero, el valor del campo en bruto se compila y renderiza a través de ’self::getTwig()  ->  createTemplate($value)  ->  render([’record’ => $this  ->  getContent()])’ sin sandboxing. El propio paquete de Bolt config/bolt/contenttypes.yaml establece ’allow_twig: true’ en el campo de contenido del tipo de contenido predeterminado ’pages’ de forma predeterminada. Cualquier usuario con acceso de edición a ese tipo de contenido (un rol de editor estándar, no solo un administrador) puede inyectar una carga útil de Twig como ’{{ [’id’]|map(’passthru’)|join }}’ que ejecuta comandos arbitrarios del sistema operativo cuando el contenido se guarda y se renderiza, logrando ejecución remota de código como el usuario del servidor web."
    }
  ],
  "affected": [
    {
      "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c",
      "affectedData": [
        {
          "vendor": "bolt",
          "product": "core",
          "defaultStatus": "unaffected",
          "programFiles": [
            "src/Entity/Field.php",
            "config/bolt/contenttypes.yaml"
          ],
          "versions": [
            {
              "version": "0",
              "lessThanOrEqual": "6.1",
              "versionType": "custom",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.9
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-08-05T15:46:43.858659Z",
          "id": "CVE-2026-71291",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-1336"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/bolt/core",
      "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c"
    },
    {
      "url": "https://github.com/bolt/core/blob/6.1/src/Entity/Field.php",
      "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c"
    }
  ]
}