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CVE-2023-43659

Estado: ModificadaMedia (5.4)—

Discourse is an open source platform for community discussion. Improper escaping of user input allowed for Cross-site Scripting attacks via the digest email preview UI. This issue only affects sites with CSP disabled. This issue has been patched in the 3.1.1 stable release as well as the 3.2.0.beta1 release. Users are advised to upgrade. Users unable to upgrade should ensure CSP is enabled on the forum.

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 (1)

Discourse — Discourse

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2023-43659",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2023-43659",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2024-09-16T15:22:33.825905Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 8,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 2.1
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 5.4,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 2.7,
        "exploitabilityScore": 2.3
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "discourse",
          "product": "discourse",
          "versions": [
            {
              "status": "affected",
              "version": "stable <= 3.1.1"
            },
            {
              "status": "affected",
              "version": "beta <= 3.2.0.beta1"
            }
          ]
        }
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    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "affectedData": [
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            "cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*"
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          "vendor": "discourse",
          "product": "discourse",
          "versions": [
            {
              "status": "affected",
              "version": "stable",
              "versionType": "custom",
              "lessThanOrEqual": "3.1.1"
            },
            {
              "status": "affected",
              "version": "beta",
              "versionType": "custom",
              "lessThanOrEqual": "3.2.0.beta1"
            }
          ],
          "defaultStatus": "unknown"
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  ],
  "published": "2023-10-16T22:15:12.237",
  "references": [
    {
      "url": "https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/discourse/discourse/security/advisories/GHSA-g4qg-5q2h-m8ph",
      "tags": [
        "Vendor Advisory"
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      "source": "security-advisories@github.com"
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      "url": "https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP",
      "tags": [
        "Third Party Advisory"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://github.com/discourse/discourse/security/advisories/GHSA-g4qg-5q2h-m8ph",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Discourse is an open source platform for community discussion. Improper escaping of user input allowed for Cross-site Scripting attacks via the digest email preview UI. This issue only affects sites with CSP disabled. This issue has been patched in the 3.1.1 stable release as well as the 3.2.0.beta1 release. Users are advised to upgrade. Users unable to upgrade should ensure CSP is enabled on the forum.\n"
    },
    {
      "lang": "es",
      "value": "Discourse es una plataforma de código abierto para el debate comunitario. El escape inadecuado de la entrada del usuario permitió ataques de Cross-Site Scripting a través de la interfaz de usuario de vista previa del resumen del correo electrónico. Este problema sólo afecta a sitios con CSP deshabilitado. Este problema se solucionó en la versión 3.1.1 stable y en la versión 3.2.0.beta1. Se recomienda a los usuarios que actualicen. Los usuarios que no puedan actualizar deben asegurarse de que CSP esté habilitado en el foro."
    }
  ],
  "lastModified": "2026-06-17T06:26:10.490",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:discourse:discourse:*:*:*:*:stable:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "6AC25048-A9DA-4EB4-A05B-33B6348539CA",
              "versionEndIncluding": "3.1.1"
            },
            {
              "criteria": "cpe:2.3:a:discourse:discourse:3.2.0:beta1:*:*:beta:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "1BFF647B-6CEF-43BF-BF5E-C82B557F78E2"
            }
          ],
          "operator": "OR"
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  "sourceIdentifier": "security-advisories@github.com"
}