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CVE-2021-21259

Estado: ModificadaMedia (6.1)—

HedgeDoc es un software de código abierto que permite crear notas markdown colaborativas en tiempo real. En HedgeDoc antes de la versión 1.7.2, un atacante puede inyectar JavaScript arbitrario en una nota de HedgeDoc, que se ejecuta cuando la nota se ve en modo de diapositivas. Dependiendo de la configuración de la instancia, el atacante puede no necesitar autenticación para crear o editar notas. El problema está parcheado en HedgeDoc versión 1.7.2. Como solución, deshabilite la carga de JavaScript desde sitios de terceros utilizando la cabecera `Content-Security-Policy`. Tenga en cuenta que esto romperá algunos contenidos incrustados

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)

Hedgedoc — Hedgedoc

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-21259",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "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
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 7.4,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 4,
        "exploitabilityScore": 2.8
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "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": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "hedgedoc",
          "product": "hedgedoc",
          "versions": [
            {
              "status": "affected",
              "version": "< 1.7.2"
            }
          ]
        }
      ]
    }
  ],
  "published": "2021-01-22T17:15:12.867",
  "references": [
    {
      "url": "https://github.com/hackmdio/codimd/issues/1648",
      "tags": [
        "Exploit",
        "Patch",
        "Third Party Advisory"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/hedgedoc/hedgedoc/commit/35b0d39a12aa35f27fba8c1f50b1886706e7efef",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/hedgedoc/hedgedoc/releases/tag/1.7.2",
      "tags": [
        "Release Notes",
        "Third Party Advisory"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-44w9-vm8p-3cxw",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/hackmdio/codimd/issues/1648",
      "tags": [
        "Exploit",
        "Patch",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://github.com/hedgedoc/hedgedoc/commit/35b0d39a12aa35f27fba8c1f50b1886706e7efef",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://github.com/hedgedoc/hedgedoc/releases/tag/1.7.2",
      "tags": [
        "Release Notes",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-44w9-vm8p-3cxw",
      "tags": [
        "Third Party 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": "HedgeDoc is open source software which lets you create real-time collaborative markdown notes. In HedgeDoc before version 1.7.2, an attacker can inject arbitrary JavaScript into a HedgeDoc note, which is executed when the note is viewed in slide mode. Depending on the configuration of the instance, the attacker may not need authentication to create or edit notes. The problem is patched in HedgeDoc 1.7.2. As a workaround, disallow loading JavaScript from 3rd party sites using the `Content-Security-Policy` header. Note that this will break some embedded content."
    },
    {
      "lang": "es",
      "value": "HedgeDoc es un software de código abierto que permite crear notas markdown colaborativas en tiempo real. En HedgeDoc antes de la versión 1.7.2, un atacante puede inyectar JavaScript arbitrario en una nota de HedgeDoc, que se ejecuta cuando la nota se ve en modo de diapositivas. Dependiendo de la configuración de la instancia, el atacante puede no necesitar autenticación para crear o editar notas. El problema está parcheado en HedgeDoc versión 1.7.2. Como solución, deshabilite la carga de JavaScript desde sitios de terceros utilizando la cabecera `Content-Security-Policy`. Tenga en cuenta que esto romperá algunos contenidos incrustados"
    }
  ],
  "lastModified": "2026-06-17T03:35:08.637",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:hedgedoc:hedgedoc:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "6EF4EA31-5B63-4C26-A744-E8A8B03D8DEC",
              "versionEndExcluding": "1.7.2"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security-advisories@github.com"
}