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CVE-2026-21393

Estado: AplazadaMedia (4.8)—

Movable Type contains a stored cross-site scripting vulnerability in Edit Comment. If crafted input is stored by an attacker, arbitrary script may be executed on a logged-in user's web browser. Note that Movable Type 7 series and 8.4 series, which are End-of-Life (EOL), are affected by the vulnerability as well.

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)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Movabletype — Movable TypeAI

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-21393",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-21393",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-02-04T16:08:19.248184Z"
        }
      }
    ],
    "cvssMetricV30": [
      {
        "type": "Secondary",
        "source": "vultures@jpcert.or.jp",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.0",
          "baseScore": 5.4,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.0/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
      }
    ],
    "cvssMetricV40": [
      {
        "type": "Secondary",
        "source": "vultures@jpcert.or.jp",
        "cvssData": {
          "Safety": "NOT_DEFINED",
          "version": "4.0",
          "Recovery": "NOT_DEFINED",
          "baseScore": 4.8,
          "Automatable": "NOT_DEFINED",
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "exploitMaturity": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED",
          "userInteraction": "ACTIVE",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "privilegesRequired": "LOW",
          "subIntegrityImpact": "LOW",
          "vulnIntegrityImpact": "NONE",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "vulnAvailabilityImpact": "NONE",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "subConfidentialityImpact": "LOW",
          "vulnConfidentialityImpact": "NONE",
          "confidentialityRequirement": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED"
        }
      }
    ]
  },
  "affected": [
    {
      "source": "vultures@jpcert.or.jp",
      "affectedData": [
        {
          "vendor": "Six Apart Ltd.",
          "product": "Movable Type (Software Edition)",
          "versions": [
            {
              "status": "affected",
              "version": "9.0.4 to 9.0.5 (9.0 series)"
            },
            {
              "status": "affected",
              "version": "8.8.0 to 8.8.1 (8.8 series)"
            },
            {
              "status": "affected",
              "version": "8.0.2 to 8.0.8 (8.0 series)"
            }
          ]
        },
        {
          "vendor": "Six Apart Ltd.",
          "product": "Movable Type Advanced (Software Edition)",
          "versions": [
            {
              "status": "affected",
              "version": "9.0.4 to 9.0.5 (9.0 series)"
            },
            {
              "status": "affected",
              "version": "8.8.0 to 8.8.1 (8.8 series)"
            },
            {
              "status": "affected",
              "version": "8.0.2 to 8.0.8 (8.0 series)"
            }
          ]
        },
        {
          "vendor": "Six Apart Ltd.",
          "product": "Movable Type Premium (Software Edition)",
          "versions": [
            {
              "status": "affected",
              "version": "9.0.4 (MTP 9.0 series)"
            },
            {
              "status": "affected",
              "version": "2.13 and earlier (MTP 2 series)"
            }
          ]
        },
        {
          "vendor": "Six Apart Ltd.",
          "product": "Movable Type Premium (Advanced Edition) (Software Edition)",
          "versions": [
            {
              "status": "affected",
              "version": "9.0.4 (MTP 9.0 series)"
            },
            {
              "status": "affected",
              "version": "2.13 and earlier (MTP 2 series)"
            }
          ]
        },
        {
          "vendor": "Six Apart Ltd.",
          "product": "Movable Type (Cloud Edition)",
          "versions": [
            {
              "status": "affected",
              "version": "9.0.5 (9 series)"
            },
            {
              "status": "affected",
              "version": "8.8.1 (8 series)"
            }
          ]
        },
        {
          "vendor": "Six Apart Ltd.",
          "product": "Movable Type Premium (Cloud Edition)",
          "versions": [
            {
              "status": "affected",
              "version": "9.0.5 (9 series)"
            },
            {
              "status": "affected",
              "version": "2.12 (MTP 2 series)"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-02-04T07:16:01.027",
  "references": [
    {
      "url": "https://jvn.jp/en/jp/JVN45405689/",
      "source": "vultures@jpcert.or.jp"
    },
    {
      "url": "https://movabletype.org/news/2026/02/mt-906-released.html",
      "source": "vultures@jpcert.or.jp"
    },
    {
      "url": "https://www.sixapart.jp/movabletype/news/2026/02/04-1100.html",
      "source": "vultures@jpcert.or.jp"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "vultures@jpcert.or.jp",
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Movable Type contains a stored cross-site scripting vulnerability in Edit Comment. If crafted input is stored by an attacker, arbitrary script may be executed on a logged-in user's web browser. Note that Movable Type 7 series and 8.4 series, which are End-of-Life (EOL), are affected by the vulnerability as well."
    },
    {
      "lang": "es",
      "value": "Movable Type contiene una vulnerabilidad de cross-site scripting almacenado en Edit Comment. Si una entrada manipulada es almacenada por un atacante, se puede ejecutar script arbitrario en el navegador web de un usuario que ha iniciado sesión. Tenga en cuenta que las series Movable Type 7 y 8.4, que están al final de su vida útil (EOL), también se ven afectadas por la vulnerabilidad."
    }
  ],
  "lastModified": "2026-06-17T10:18:37.133",
  "sourceIdentifier": "vultures@jpcert.or.jp"
}