CVE-2024-47873

Estado: AnalizadaAlta (7.5)—

PhpSpreadsheet is a PHP library for reading and writing spreadsheet files. The XmlScanner class has a scan method which should prevent XXE attacks. However, prior to versions 1.9.4, 2.1.3, 2.3.2, and 3.4.0, the regexes used in the `scan` method and the findCharSet method can be bypassed by using UCS-4 and encoding guessing. An attacker can bypass the sanitizer and achieve an XML external entity attack. Versions 1.9.4, 2.1.3, 2.3.2, and 3.4.0 fix the issue.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Puntuación base: 7.5

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.74%
Percentil entre todas las CVEs puntuadas: 53
Fecha de la puntuación: 5/10/2026

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.

ExplotaciónT1190 Exploit Public-Facing Applicationinitial access85 %
Impacto principalT1005 Data from Local Systemcollection90 %
Impacto secundarioT1056.004 Credential API Hookingcollection · credential access60 %

AV:N/AC:L/PR:N sin UI permite explotación remota de aplicación web (XXE). XXE lee datos sensibles del servidor (T1005) y puede permitir SSRF (T1090).

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

Vulnerability Scanning Privileged Account Management Network Segmentation Limit Access to Resource Over Network Filter Network Traffic Application Isolation and Sandboxing

Tecnologías afectadas (1)

Phpoffice — Phpspreadsheet

CWE

CWE-611

Referencias

JSON original (NVD)

Mostrar

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  "cveTags": [],
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          "role": "CISA Coordinator",
          "options": [
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              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2024-11-18T18:28:33.862619Z"
        }
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
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        "impactScore": 3.6,
        "exploitabilityScore": 3.9
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      {
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        "source": "nvd@nist.gov",
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
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          "confidentialityImpact": "HIGH"
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        "exploitabilityScore": 3.9
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  "affected": [
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          "product": "PhpSpreadsheet",
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              "version": "< 1.29.4"
            },
            {
              "status": "affected",
              "version": ">= 2.0.0, < 2.1.3"
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      "affectedData": [
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          "product": "phpspreadsheet",
          "versions": [
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              "status": "affected",
              "version": "0",
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              "versionType": "custom"
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          "defaultStatus": "unknown"
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  ],
  "published": "2024-11-18T17:15:11.973",
  "references": [
    {
      "url": "https://github.com/PHPOffice/PhpSpreadsheet/blob/39fc51309181e82593b06e2fa8e45ef8333a0335/src/PhpSpreadsheet/Reader/Security/XmlScanner.php",
      "tags": [
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    },
    {
      "url": "https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-jw4x-v69f-hh5w",
      "tags": [
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      "source": "security-advisories@github.com"
    },
    {
      "url": "https://owasp.org/www-community/vulnerabilities/XML_External_Entity_(XXE)_Processing",
      "tags": [
        "Not Applicable"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://www.w3.org/TR/xml/#sec-guessing-no-ext-info",
      "tags": [
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      "source": "security-advisories@github.com"
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  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-611"
        }
      ]
    }
  ],
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      "lang": "en",
      "value": "PhpSpreadsheet is a PHP library for reading and writing spreadsheet files. The XmlScanner class has a scan method which should prevent XXE attacks. However, prior to versions 1.9.4, 2.1.3, 2.3.2, and 3.4.0, the regexes used in the `scan` method and the findCharSet method can be bypassed by using UCS-4 and encoding guessing. An attacker can bypass the sanitizer and achieve an XML external entity attack. Versions 1.9.4, 2.1.3, 2.3.2, and 3.4.0 fix the issue."
    },
    {
      "lang": "es",
      "value": "PhpSpreadsheet es una librería PHP para leer y escribir archivos de hojas de cálculo. La clase XmlScanner tiene un método de escaneo que debería evitar ataques XXE. Sin embargo, antes de las versiones 1.9.4, 2.1.3, 2.3.2 y 3.4.0, las expresiones regulares utilizadas en el método `scan` y en el método findCharSet se pueden omitir utilizando UCS-4 y adivinando la codificación. Un atacante puede omitir el desinfectante y lograr un ataque de entidad externa XML. Las versiones 1.9.4, 2.1.3, 2.3.2 y 3.4.0 solucionan el problema."
    }
  ],
  "lastModified": "2026-06-17T07:57:53.700",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "versionEndExcluding": "1.29.4"
            },
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