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CVE-2020-4070

Estado: ModificadaMedia (5.4)—

In CSS Validator less than or equal to commit 54d68a1, there is a cross-site scripting vulnerability in handling URIs. A user would have to click on a specifically crafted validator link to trigger it. This has been patched in commit e5c09a9.

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)

W3C — CSS Validator

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2020-4070",
  "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": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 4.6,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 2.5,
        "exploitabilityScore": 2.1
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "CHANGED",
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          "baseScore": 5.4,
          "attackVector": "NETWORK",
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N",
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          "userInteraction": "REQUIRED",
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          "availabilityImpact": "NONE",
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  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "World Wide Web Consortium (W3C)",
          "product": "CSS Validator",
          "versions": [
            {
              "status": "affected",
              "version": "<= 54d68a1"
            }
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      ]
    }
  ],
  "published": "2020-06-22T16:15:11.963",
  "references": [
    {
      "url": "https://github.com/w3c/css-validator/commit/e5c09a9119167d3064db786d5f00d730b584a53b",
      "tags": [
        "Patch"
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      "url": "https://github.com/w3c/css-validator/security/advisories/GHSA-wf36-7w73-rh8c",
      "tags": [
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    },
    {
      "url": "https://github.com/w3c/css-validator/commit/e5c09a9119167d3064db786d5f00d730b584a53b",
      "tags": [
        "Patch"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://github.com/w3c/css-validator/security/advisories/GHSA-wf36-7w73-rh8c",
      "tags": [
        "Vendor 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": "In CSS Validator less than or equal to commit 54d68a1, there is a cross-site scripting vulnerability in handling URIs. A user would have to click on a specifically crafted validator link to trigger it. This has been patched in commit e5c09a9."
    },
    {
      "lang": "es",
      "value": "En CSS Validator, menor o igual al commit 54d68a1, se presenta una vulnerabilidad de tipo cross-site scripting al manejar los URI. Un usuario tendría que hacer clic en un enlace validador específicamente diseñado para activarlo. Esto ha sido parcheado en el commit e5c09a9"
    }
  ],
  "lastModified": "2026-06-17T03:19:31.040",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:w3c:css_validator:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "5B629E2A-714E-4901-8AFB-09B637FC058D",
              "versionEndIncluding": "2020-01-19"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security-advisories@github.com"
}