FKIE_CVE-2020-7773

Vulnerability from fkie_nvd - Published: 2020-11-16 12:15 - Updated: 2026-06-17 03:25
Severity
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
6.1 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Summary
This affects the package markdown-it-highlightjs before 3.3.1. It is possible insert malicious JavaScript as a value of lang in the markdown-it-highlightjs Inline code highlighting feature. const markdownItHighlightjs = require("markdown-it-highlightjs"); const md = require('markdown-it'); const reuslt_xss = md() .use(markdownItHighlightjs, { inline: true }) .render('console.log(42){.">js}'); console.log(reuslt_xss);
References
report@snyk.iohttps://github.com/valeriangalliat/markdown-it-highlightjs/blob/v3.3.0/index.js%23L52Broken Link
report@snyk.iohttps://github.com/valeriangalliat/markdown-it-highlightjs/pull/14Exploit, Third Party Advisory
report@snyk.iohttps://snyk.io/vuln/SNYK-JS-MARKDOWNITHIGHLIGHTJS-1040461Mitigation, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/valeriangalliat/markdown-it-highlightjs/blob/v3.3.0/index.js%23L52Broken Link
af854a3a-2127-422b-91ae-364da2661108https://github.com/valeriangalliat/markdown-it-highlightjs/pull/14Exploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://snyk.io/vuln/SNYK-JS-MARKDOWNITHIGHLIGHTJS-1040461Mitigation, Third Party Advisory
Impacted products
Vendor Product Version
markdown-it-highlightjs_project markdown-it-highlightjs *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "markdown-it-highlightjs",
          "vendor": "n/a",
          "versions": [
            {
              "lessThan": "3.3.1",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "report@snyk.io"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:markdown-it-highlightjs_project:markdown-it-highlightjs:*:*:*:*:*:node.js:*:*",
              "matchCriteriaId": "0E6E72E4-63FE-41AA-BBE5-19C53DD52AD1",
              "versionEndExcluding": "3.3.1",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "This affects the package markdown-it-highlightjs before 3.3.1. It is possible insert malicious JavaScript as a value of lang in the markdown-it-highlightjs Inline code highlighting feature. const markdownItHighlightjs = require(\"markdown-it-highlightjs\"); const md = require(\u0027markdown-it\u0027); const reuslt_xss = md() .use(markdownItHighlightjs, { inline: true }) .render(\u0027console.log(42){.\"\u003ejs}\u0027); console.log(reuslt_xss);"
    },
    {
      "lang": "es",
      "value": "Esto afecta al paquete markdown-it-highlightjs versiones anteriores a 3.3.1.\u0026#xa0;Es posible insertar JavaScript malicioso como valor de lang en la funcionalidad de resaltado de c\u00f3digo en l\u00ednea markdown-it-highlightjs.\u0026#xa0;const markdownItHighlightjs = require(\"markdown-it-highlightjs\");\u0026#xa0;const md = require(\"markdown-it\");\u0026#xa0;const reuslt_xss = md() .use(markdownItHighlightjs, {inline: true}) .render(\"console.log(42){.\")js}\u0027); console.log(reuslt_xss)"
    }
  ],
  "id": "CVE-2020-7773",
  "lastModified": "2026-06-17T03:25:25.287",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "MEDIUM",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "NONE",
          "baseScore": 4.3,
          "confidentialityImpact": "NONE",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N",
          "version": "2.0"
        },
        "exploitabilityScore": 8.6,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "report@snyk.io",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.1,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 2.7,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2020-11-16T12:15:14.463",
  "references": [
    {
      "source": "report@snyk.io",
      "tags": [
        "Broken Link"
      ],
      "url": "https://github.com/valeriangalliat/markdown-it-highlightjs/blob/v3.3.0/index.js%23L52"
    },
    {
      "source": "report@snyk.io",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://github.com/valeriangalliat/markdown-it-highlightjs/pull/14"
    },
    {
      "source": "report@snyk.io",
      "tags": [
        "Mitigation",
        "Third Party Advisory"
      ],
      "url": "https://snyk.io/vuln/SNYK-JS-MARKDOWNITHIGHLIGHTJS-1040461"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Broken Link"
      ],
      "url": "https://github.com/valeriangalliat/markdown-it-highlightjs/blob/v3.3.0/index.js%23L52"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://github.com/valeriangalliat/markdown-it-highlightjs/pull/14"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mitigation",
        "Third Party Advisory"
      ],
      "url": "https://snyk.io/vuln/SNYK-JS-MARKDOWNITHIGHLIGHTJS-1040461"
    }
  ],
  "sourceIdentifier": "report@snyk.io",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.