gsd-2020-26237
Vulnerability from gsd
Modified
2023-12-13 01:22
Details
Highlight.js is a syntax highlighter written in JavaScript. Highlight.js versions before 9.18.2 and 10.1.2 are vulnerable to Prototype Pollution. A malicious HTML code block can be crafted that will result in prototype pollution of the base object's prototype during highlighting. If you allow users to insert custom HTML code blocks into your page/app via parsing Markdown code blocks (or similar) and do not filter the language names the user can provide you may be vulnerable. The pollution should just be harmless data but this can cause problems for applications not expecting these properties to exist and can result in strange behavior or application crashes, i.e. a potential DOS vector. If your website or application does not render user provided data it should be unaffected. Versions 9.18.2 and 10.1.2 and newer include fixes for this vulnerability. If you are using version 7 or 8 you are encouraged to upgrade to a newer release.
Aliases
Aliases
CVE-2020-26237


To clipboard 

{
  "GSD": {
    "alias": "CVE-2020-26237",
    "description": "Highlight.js is a syntax highlighter written in JavaScript. Highlight.js versions before 9.18.2 and 10.1.2 are vulnerable to Prototype Pollution. A malicious HTML code block can be crafted that will result in prototype pollution of the base object\u0027s prototype during highlighting. If you allow users to insert custom HTML code blocks into your page/app via parsing Markdown code blocks (or similar) and do not filter the language names the user can provide you may be vulnerable. The pollution should just be harmless data but this can cause problems for applications not expecting these properties to exist and can result in strange behavior or application crashes, i.e. a potential DOS vector. If your website or application does not render user provided data it should be unaffected. Versions 9.18.2 and 10.1.2 and newer include fixes for this vulnerability. If you are using version 7 or 8 you are encouraged to upgrade to a newer release.",
    "id": "GSD-2020-26237",
    "references": [
      "https://access.redhat.com/errata/RHSA-2021:3917",
      "https://www.suse.com/security/cve/CVE-2020-26237.html"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2020-26237"
      ],
      "details": "Highlight.js is a syntax highlighter written in JavaScript. Highlight.js versions before 9.18.2 and 10.1.2 are vulnerable to Prototype Pollution. A malicious HTML code block can be crafted that will result in prototype pollution of the base object\u0027s prototype during highlighting. If you allow users to insert custom HTML code blocks into your page/app via parsing Markdown code blocks (or similar) and do not filter the language names the user can provide you may be vulnerable. The pollution should just be harmless data but this can cause problems for applications not expecting these properties to exist and can result in strange behavior or application crashes, i.e. a potential DOS vector. If your website or application does not render user provided data it should be unaffected. Versions 9.18.2 and 10.1.2 and newer include fixes for this vulnerability. If you are using version 7 or 8 you are encouraged to upgrade to a newer release.",
      "id": "GSD-2020-26237",
      "modified": "2023-12-13T01:22:09.014727Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
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        "STATE": "PUBLIC",
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      },
      "affects": {
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            "value": "Highlight.js is a syntax highlighter written in JavaScript. Highlight.js versions before 9.18.2 and 10.1.2 are vulnerable to Prototype Pollution. A malicious HTML code block can be crafted that will result in prototype pollution of the base object\u0027s prototype during highlighting. If you allow users to insert custom HTML code blocks into your page/app via parsing Markdown code blocks (or similar) and do not filter the language names the user can provide you may be vulnerable. The pollution should just be harmless data but this can cause problems for applications not expecting these properties to exist and can result in strange behavior or application crashes, i.e. a potential DOS vector. If your website or application does not render user provided data it should be unaffected. Versions 9.18.2 and 10.1.2 and newer include fixes for this vulnerability. If you are using version 7 or 8 you are encouraged to upgrade to a newer release."
          }
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      },
      "impact": {
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          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.8,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:N/I:H/A:N",
          "version": "3.1"
        }
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          },
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            "url": "https://www.oracle.com/security-alerts/cpujul2022.html"
          }
        ]
      },
      "source": {
        "advisory": "GHSA-vfrc-7r7c-w9mx",
        "discovery": "UNKNOWN"
      }
    },
    "gitlab.com": {
      "advisories": [
        {
          "affected_range": "\u003c9.18.2||\u003e=10.1.0 \u003c10.1.2",
          "affected_versions": "All versions before 9.18.2, all versions starting from 10.1.0 before 10.1.2",
          "cvss_v2": "AV:N/AC:M/Au:S/C:N/I:P/A:P",
          "cvss_v3": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N",
          "cwe_ids": [
            "CWE-1035",
            "CWE-471",
            "CWE-937"
          ],
          "date": "2020-12-31",
          "description": "`highlight.js` is vulnerable to Prototype Pollution. A malicious HTML code block can be crafted that will result in prototype pollution of the base object\u0027s prototype during highlighting. If you allow users to insert custom HTML code blocks into your `page/app` via parsing Markdown code blocks (or similar) and do not filter the language names the user can provide you may be vulnerable. The pollution should just be harmless data but this can cause problems for applications not expecting these properties to exist and can result in strange behavior or application crashes, i.e., a potential DoS vector. If your website or application does not render user provided data it should be unaffected. and newer include fixes for this vulnerability.",
          "fixed_versions": [
            "9.18.2",
            "10.1.2"
          ],
          "identifier": "CVE-2020-26237",
          "identifiers": [
            "CVE-2020-26237",
            "GHSA-vfrc-7r7c-w9mx"
          ],
          "not_impacted": "All versions starting from 9.18.2 before 10.1.0, all versions starting from 10.1.2",
          "package_slug": "npm/highlight.js",
          "pubdate": "2020-11-24",
          "solution": "Upgrade to versions 9.18.2, 10.1.2 or above.",
          "title": "Modification of Assumed-Immutable Data (MAID)",
          "urls": [
            "https://nvd.nist.gov/vuln/detail/CVE-2020-26237"
          ],
          "uuid": "84467c28-0199-40b8-9735-cf6d57b46df8"
        }
      ]
    },
    "nvd.nist.gov": {
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        "nodes": [
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            "children": [],
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          "cvssV2": {
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            "accessVector": "NETWORK",
            "authentication": "SINGLE",
            "availabilityImpact": "PARTIAL",
            "baseScore": 4.9,
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            "integrityImpact": "PARTIAL",
            "vectorString": "AV:N/AC:M/Au:S/C:N/I:P/A:P",
            "version": "2.0"
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          "exploitabilityScore": 6.8,
          "impactScore": 4.9,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "MEDIUM",
          "userInteractionRequired": true
        },
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            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.3,
          "impactScore": 5.8
        }
      },
      "lastModifiedDate": "2022-10-19T13:49Z",
      "publishedDate": "2020-11-24T23:15Z"
    }
  }
}


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