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CVE-2021-20811

Estado: ModificadaMedia (6.1)—

Cross-site scripting vulnerability in List of Assets screen of Movable Type (Movable Type 7 r.4903 and earlier (Movable Type 7 Series), Movable Type 6.8.0 and earlier (Movable Type 6 Series), Movable Type Advanced 7 r.4903 and earlier (Movable Type Advanced 7 Series), Movable Type Premium 1.44 and earlier, and Movable Type Premium Advanced 1.44 and earlier) allows remote attackers to inject arbitrary script or HTML via unspecified vectors.

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)

Sixapart — Movable Type

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-20811",
  "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": "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": "vultures@jpcert.or.jp",
      "affectedData": [
        {
          "vendor": "Six Apart Ltd.",
          "product": "Movable Type",
          "versions": [
            {
              "status": "affected",
              "version": "Movable Type 7 r.4903 and earlier (Movable Type 7 Series), Movable Type 6.8.0 and earlier (Movable Type 6 Series), Movable Type Advanced 7 r.4903 and earlier (Movable Type Advanced 7 Series), Movable Type Premium 1.44 and earlier, and Movable Type Premium Advanced 1.44 and earlier"
            }
          ]
        }
      ]
    }
  ],
  "published": "2021-08-26T02:15:11.497",
  "references": [
    {
      "url": "https://jvn.jp/en/jp/JVN97545738/index.html",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "vultures@jpcert.or.jp"
    },
    {
      "url": "https://movabletype.org/news/2021/08/mt-780-681-released.html",
      "tags": [
        "Release Notes",
        "Vendor Advisory"
      ],
      "source": "vultures@jpcert.or.jp"
    },
    {
      "url": "https://jvn.jp/en/jp/JVN97545738/index.html",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://movabletype.org/news/2021/08/mt-780-681-released.html",
      "tags": [
        "Release Notes",
        "Vendor 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": "Cross-site scripting vulnerability in List of Assets screen of Movable Type (Movable Type 7 r.4903 and earlier (Movable Type 7 Series), Movable Type 6.8.0 and earlier (Movable Type 6 Series), Movable Type Advanced 7 r.4903 and earlier (Movable Type Advanced 7 Series), Movable Type Premium 1.44 and earlier, and Movable Type Premium Advanced 1.44 and earlier) allows remote attackers to inject arbitrary script or HTML via unspecified vectors."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad de tipo cross-site scripting en la pantalla List of Assets de Movable Type (Movable Type 7 versiones r.4903 y anteriores (Movable Type 7 Series), Movable Type versiones 6.8.0 y anteriores (Movable Type 6 Series), Movable Type Advanced 7 versiones r.4903 y anteriores (Movable Type Advanced 7 Series), Movable Type Premium versiones 1.44 y anteriores, y Movable Type Premium Advanced versiones 1.44 y anteriores), permite a atacantes remotos inyectar script arbitrario o HTML por medio de vectores no especificados."
    }
  ],
  "lastModified": "2026-06-17T03:34:29.473",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:sixapart:movable_type:*:*:*:*:premium:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "9ED3A1ED-558E-4783-8BCA-47BB68E92D9D",
              "versionEndIncluding": "1.44"
            },
            {
              "criteria": "cpe:2.3:a:sixapart:movable_type:*:*:*:*:premium_advanced:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "69B0E270-7BF7-4B9F-974B-B71B11788D5E",
              "versionEndIncluding": "1.44"
            },
            {
              "criteria": "cpe:2.3:a:sixapart:movable_type:*:*:*:*:-:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "7BA76A65-0518-40F0-AE15-4EE416911E27",
              "versionEndIncluding": "6.8.0",
              "versionStartIncluding": "6.0"
            },
            {
              "criteria": "cpe:2.3:a:sixapart:movable_type:*:*:*:*:-:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "D37106C9-92CD-44A8-A80B-57754207AE80",
              "versionEndExcluding": "7.8.0",
              "versionStartIncluding": "7.0"
            },
            {
              "criteria": "cpe:2.3:a:sixapart:movable_type:*:*:*:*:advanced:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "5CA5A16F-B42D-4DC7-B9A0-5CA49B05DA7B",
              "versionEndExcluding": "7.8.0",
              "versionStartIncluding": "7.0"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "vultures@jpcert.or.jp"
}