CVE-2024-48917

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, in a bypass of the previously reported `CVE-2024-47873`, the regexes from the `findCharSet` method, which is used for determining the current encoding can be bypassed by using a payload in the encoding UTF-7, and adding at end of the file a comment with the value `encoding="UTF-8"` with `"`, which is matched by the first regex, so that `encoding='UTF-7'` with single quotes `'` in the XML header is not matched by the second regex. 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: 0.73%
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 Systemcollection80 %

XXE (CWE-611) en librería PHP expuesta en red permite lectura de archivos XML del servidor. AV:N, PR:N, UI:N indican acceso remoto sin autenticación; bypass de sanitizador de encoding confirma explotabilidad remota.

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)

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{
  "id": "CVE-2024-48917",
  "cveTags": [],
  "metrics": {
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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          "id": "CVE-2024-48917",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2024-11-18T20:14:30.431041Z"
        }
      }
    ],
    "cvssMetricV31": [
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          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "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"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
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          "baseSeverity": "HIGH",
          "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"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ]
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  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "PHPOffice",
          "product": "PhpSpreadsheet",
          "versions": [
            {
              "status": "affected",
              "version": "< 1.29.4"
            },
            {
              "status": "affected",
              "version": ">= 2.0.0, < 2.1.3"
            },
            {
              "status": "affected",
              "version": ">= 2.2.0, < 2.3.2"
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              "version": ">= 3.3.0, < 3.4.0"
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    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "affectedData": [
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          "vendor": "phpoffice",
          "product": "phpspreadsheet",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "1.29.4",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "2.0.0",
              "lessThan": "2.1.3",
              "versionType": "custom"
            },
            {
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              "version": "2.2.0",
              "lessThan": "2.3.2",
              "versionType": "custom"
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            {
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              "version": "3.3.0",
              "lessThan": "3.4.0",
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          "defaultStatus": "unknown"
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  ],
  "published": "2024-11-18T20:15:05.403",
  "references": [
    {
      "url": "https://github.com/PHPOffice/PhpSpreadsheet/blob/39fc51309181e82593b06e2fa8e45ef8333a0335/src/PhpSpreadsheet/Reader/Security/XmlScanner.php",
      "tags": [
        "Product"
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    },
    {
      "url": "https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-7cc9-j4mv-vcjp",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "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"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-611"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "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, in a bypass of the previously reported `CVE-2024-47873`, the regexes from the `findCharSet` method, which is used for determining the current encoding can be bypassed by using a payload in the encoding UTF-7, and adding at end of the file a comment with the value `encoding=\"UTF-8\"` with `\"`, which is matched by the first regex, so that `encoding='UTF-7'` with single quotes `'` in the XML header is not matched by the second regex. 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, en una omisión del `CVE-2024-47873` informado anteriormente, las expresiones regulares del método `findCharSet`, que se utiliza para determinar la codificación actual, se pueden omitir utilizando un payload en la codificación UTF-7 y agregando al final del archivo un comentario con el valor `encoding=\"UTF-8\"` con `\"`, que coincide con la primera expresión regular, de modo que `encoding='UTF-7'` con comillas simples `'` en el encabezado XML no coincida con la segunda expresión regular. 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": "2026-06-17T07:59:02.040",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "criteria": "cpe:2.3:a:phpoffice:phpspreadsheet:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "9D7D4C48-5455-494C-962A-B8386CA53A62",
              "versionEndExcluding": "1.29.4"
            },
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              "vulnerable": true,
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}