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CVE-2021-20681

Estado: ModificadaMedia (5.4)—

Una neutralización inapropiada de la entrada de JavaScript en la función page editing de baserCMS versiones anteriores a 4.4.5, permite a atacantes autenticados remotamente inyectar un script arbitrario por medio de vectores no especificados.

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)

Basercms — Basercms

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-20681",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 3.5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:S/C:N/I:P/A:N",
          "authentication": "SINGLE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "LOW",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 6.8,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV31": [
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          "scope": "CHANGED",
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          "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": "vultures@jpcert.or.jp",
      "affectedData": [
        {
          "vendor": "baserCMS Users Community",
          "product": "baserCMS",
          "versions": [
            {
              "status": "affected",
              "version": "versions prior to 4.4.5"
            }
          ]
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      ]
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  ],
  "published": "2021-03-26T09:15:12.043",
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    {
      "url": "https://basercms.net/security/JVN64869876",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
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    },
    {
      "url": "https://jvn.jp/en/jp/JVN64869876/index.html",
      "tags": [
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      ],
      "source": "vultures@jpcert.or.jp"
    },
    {
      "url": "https://basercms.net/security/JVN64869876",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
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    },
    {
      "url": "https://jvn.jp/en/jp/JVN64869876/index.html",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Improper neutralization of JavaScript input in the page editing function of baserCMS versions prior to 4.4.5 allows remote authenticated attackers to inject an arbitrary script via unspecified vectors."
    },
    {
      "lang": "es",
      "value": "Una neutralización inapropiada de la entrada de JavaScript en la función page editing de  baserCMS versiones anteriores a 4.4.5, permite a atacantes autenticados remotamente inyectar un script arbitrario por medio de vectores no especificados."
    }
  ],
  "lastModified": "2026-06-17T03:34:14.393",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "vulnerable": true,
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              "versionEndExcluding": "4.4.5"
            }
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          "operator": "OR"
        }
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  ],
  "sourceIdentifier": "vultures@jpcert.or.jp"
}