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CVE-2021-3906

Estado: ModificadaMedia (6.5)—

bookstack is vulnerable to Unrestricted Upload of File with Dangerous Type

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)

Bookstackapp — Bookstack

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-3906",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 4,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:S/C:P/I:N/A:N",
          "authentication": "SINGLE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV30": [
      {
        "type": "Secondary",
        "source": "security@huntr.dev",
        "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
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 6.5,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "security@huntr.dev",
      "affectedData": [
        {
          "vendor": "bookstackapp",
          "product": "bookstackapp/bookstack",
          "versions": [
            {
              "status": "affected",
              "version": "unspecified",
              "lessThan": "21.10.1",
              "versionType": "custom"
            }
          ]
        }
      ]
    }
  ],
  "published": "2021-10-27T22:15:07.817",
  "references": [
    {
      "url": "https://github.com/bookstackapp/bookstack/commit/64937ab826b56d086af9ecea532510d37520ebc8",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "source": "security@huntr.dev"
    },
    {
      "url": "https://huntr.dev/bounties/f115bdf5-c06b-4627-a6fa-ba6904a43ba3",
      "tags": [
        "Exploit",
        "Issue Tracking",
        "Patch",
        "Third Party Advisory"
      ],
      "source": "security@huntr.dev"
    },
    {
      "url": "https://github.com/bookstackapp/bookstack/commit/64937ab826b56d086af9ecea532510d37520ebc8",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://huntr.dev/bounties/f115bdf5-c06b-4627-a6fa-ba6904a43ba3",
      "tags": [
        "Exploit",
        "Issue Tracking",
        "Patch",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security@huntr.dev",
      "description": [
        {
          "lang": "en",
          "value": "CWE-434"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "bookstack is vulnerable to Unrestricted Upload of File with Dangerous Type"
    },
    {
      "lang": "es",
      "value": "bookstack es vulnerable a una Carga no Restringida de Archivos de Tipo Peligroso"
    }
  ],
  "lastModified": "2026-06-17T04:05:58.017",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:bookstackapp:bookstack:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "91F81186-7056-4717-BFAE-66CC63117B8F",
              "versionEndExcluding": "21.10.1"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security@huntr.dev"
}