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CVE-2026-8365

Estado: AplazadaAlta (8.8)—

The Blocksy theme for WordPress is vulnerable to PHP Object Injection leading to Remote Code Execution via the 'blocksy_meta' REST API field and the V200 database migration in versions up to and including 2.1.35. This is due to insufficient input sanitization in the blocksy_sanitize_post_meta_options() function, which only blocks values containing '<' or '>' and does not prevent serialized PHP object strings from being stored in post meta, combined with the SearchReplacer::run_recursively() function unconditionally deserializing all string values via @unserialize() during migration without restricting allowed classes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject a serialized Blocksy\RaiiPattern object into post meta that, when the V200 migration runs on an upgraded site, is deserialized and triggers RaiiPattern::__destruct(), which executes arbitrary PHP callables via call_user_func().

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vulnerabilidad en API REST de WordPress con PR:L requiere autenticación (contributor+) y acceso en red adyacente (T1210). RCE vía deserialización PHP de objetos (T1059). Acceso autenticado contribuidor permite también manipulación de cuentas (T1098).

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Privileged Account ManagementDisable or Remove Feature or ProgramNetwork SegmentationVulnerability ScanningUser Account ManagementThreat Intelligence Program

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Creativethemes — BlocksyAI

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-8365",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-8365",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-06-09T12:55:53.628058Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security@wordfence.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 8.8,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "security@wordfence.com",
      "affectedData": [
        {
          "vendor": "creativethemeshq",
          "product": "Blocksy",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "versionType": "semver",
              "lessThanOrEqual": "2.1.41"
            }
          ],
          "defaultStatus": "unaffected"
        }
      ]
    }
  ],
  "published": "2026-06-09T09:16:31.013",
  "references": [
    {
      "url": "https://themes.trac.wordpress.org/browser/blocksy/2.1.35/admin/helpers/meta-boxes.php#L104",
      "source": "security@wordfence.com"
    },
    {
      "url": "https://themes.trac.wordpress.org/browser/blocksy/2.1.35/admin/helpers/validator.php#L75",
      "source": "security@wordfence.com"
    },
    {
      "url": "https://themes.trac.wordpress.org/browser/blocksy/2.1.35/inc/classes/db-versioning/utils/db-search-replacer.php#L98",
      "source": "security@wordfence.com"
    },
    {
      "url": "https://themes.trac.wordpress.org/browser/blocksy/2.1.35/inc/classes/raii.php#L12",
      "source": "security@wordfence.com"
    },
    {
      "url": "https://themes.trac.wordpress.org/browser/blocksy/2.1.41/admin/helpers/meta-boxes.php#L104",
      "source": "security@wordfence.com"
    },
    {
      "url": "https://themes.trac.wordpress.org/browser/blocksy/2.1.41/admin/helpers/validator.php#L75",
      "source": "security@wordfence.com"
    },
    {
      "url": "https://themes.trac.wordpress.org/browser/blocksy/2.1.41/inc/classes/db-versioning/utils/db-search-replacer.php#L98",
      "source": "security@wordfence.com"
    },
    {
      "url": "https://themes.trac.wordpress.org/browser/blocksy/2.1.41/inc/classes/raii.php#L12",
      "source": "security@wordfence.com"
    },
    {
      "url": "https://themes.trac.wordpress.org/browser/blocksy/trunk/admin/helpers/meta-boxes.php#L104",
      "source": "security@wordfence.com"
    },
    {
      "url": "https://themes.trac.wordpress.org/browser/blocksy/trunk/admin/helpers/validator.php#L75",
      "source": "security@wordfence.com"
    },
    {
      "url": "https://themes.trac.wordpress.org/browser/blocksy/trunk/inc/classes/db-versioning/utils/db-search-replacer.php#L98",
      "source": "security@wordfence.com"
    },
    {
      "url": "https://themes.trac.wordpress.org/browser/blocksy/trunk/inc/classes/raii.php#L12",
      "source": "security@wordfence.com"
    },
    {
      "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/fd216743-ce8d-4632-9fd1-d63502c2dfcd?source=cve",
      "source": "security@wordfence.com"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security@wordfence.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-502"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The Blocksy theme for WordPress is vulnerable to PHP Object Injection leading to Remote Code Execution via the 'blocksy_meta' REST API field and the V200 database migration in versions up to and including 2.1.35. This is due to insufficient input sanitization in the blocksy_sanitize_post_meta_options() function, which only blocks values containing '<' or '>' and does not prevent serialized PHP object strings from being stored in post meta, combined with the SearchReplacer::run_recursively() function unconditionally deserializing all string values via @unserialize() during migration without restricting allowed classes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject a serialized Blocksy\\RaiiPattern object into post meta that, when the V200 migration runs on an upgraded site, is deserialized and triggers RaiiPattern::__destruct(), which executes arbitrary PHP callables via call_user_func()."
    },
    {
      "lang": "es",
      "value": "El tema Blocksy para WordPress es vulnerable a la inyección de objetos PHP que conduce a la ejecución remota de código a través del campo de la API REST 'blocksy_meta' y la migración de la base de datos V200 en versiones hasta la 2.1.35 inclusive. Esto se debe a una sanitización insuficiente de la entrada en la función blocksy_sanitize_post_meta_options(), que solo bloquea valores que contienen '<' o '>' y no evita que las cadenas de objetos PHP serializados se almacenen en los metadatos de las publicaciones, combinado con la función SearchReplacer::run_recursively() que deserializa incondicionalmente todos los valores de cadena a través de @unserialize() durante la migración sin restringir las clases permitidas. Esto hace posible que atacantes autenticados, con acceso de nivel de colaborador y superior, inyecten un objeto Blocksy\\RaiiPattern serializado en los metadatos de las publicaciones que, cuando la migración V200 se ejecuta en un sitio actualizado, es deserializado y activa RaiiPattern::__destruct(), que ejecuta callables PHP arbitrarios a través de call_user_func()."
    }
  ],
  "lastModified": "2026-07-23T08:10:00.137",
  "sourceIdentifier": "security@wordfence.com"
}