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CVE-2021-43558

Estado: ModificadaMedia (6.1)—

A flaw was found in Moodle in versions 3.11 to 3.11.3, 3.10 to 3.10.7, 3.9 to 3.9.10 and earlier unsupported versions. A URL parameter in the filetype site administrator tool required extra sanitizing to prevent a reflected XSS risk.

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).

Tecnologías afectadas (3)

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-43558",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
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          "baseScore": 4.3,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": true
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    "cvssMetricV31": [
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          "scope": "CHANGED",
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          "baseScore": 6.1,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 2.7,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "patrick@puiterwijk.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "moodle",
          "versions": [
            {
              "status": "affected",
              "version": "moodle 3.11.4, moodle 3.10.8 and moodle 3.9.11"
            }
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  ],
  "published": "2021-11-22T16:15:08.237",
  "references": [
    {
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2021515",
      "tags": [
        "Issue Tracking",
        "Third Party Advisory"
      ],
      "source": "patrick@puiterwijk.org"
    },
    {
      "url": "https://moodle.org/mod/forum/discuss.php?d=429097",
      "tags": [
        "Patch",
        "Vendor Advisory"
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      "source": "patrick@puiterwijk.org"
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    {
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2021515",
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      "url": "https://moodle.org/mod/forum/discuss.php?d=429097",
      "tags": [
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        "Vendor Advisory"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "patrick@puiterwijk.org",
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
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  ],
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    {
      "lang": "en",
      "value": "A flaw was found in Moodle in versions 3.11 to 3.11.3, 3.10 to 3.10.7, 3.9 to 3.9.10 and earlier unsupported versions. A URL parameter in the filetype site administrator tool required extra sanitizing to prevent a reflected XSS risk."
    },
    {
      "lang": "es",
      "value": "Se encontró un fallo en Moodle en versiones 3.11 a 3.11.3, 3.10 a 3.10.7, 3.9 a 3.9.10 y versiones anteriores no soportadas. Un parámetro de URL en la herramienta de administración del sitio filetype requería un saneamiento adicional para evitar un riesgo de un ataque de tipo XSS reflejado"
    }
  ],
  "lastModified": "2026-06-17T04:11:08.023",
  "configurations": [
    {
      "nodes": [
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