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FKIE_CVE-2018-1000874

Vulnerability from fkie_nvd - Published: 2018-12-20 17:29 - Updated: 2026-06-17 01:33
Severity
6.1 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Summary
PHP cebe markdown parser version 1.2.0 and earlier contains a Cross Site Scripting (XSS) vulnerability in all distributed parsers allowing a malicious crafted script to be executed that can result in the lose of user data and sensitive user information. This attack can be exploited by crafting a three backtick wrapped payload with a character in front: L: "```<script>alert();</script>```". NOTE: This has been argued as a non-issue (see references) since it is not the parser's job to sanitize malicious code from a parsed document
References
cve@mitre.orghttps://github.com/cebe/markdown/issues/166Exploit, Issue Tracking, Third Party Advisory
cve@mitre.orghttps://github.com/cebe/markdown/issues/166#issuecomment-508230493
af854a3a-2127-422b-91ae-364da2661108https://github.com/cebe/markdown/issues/166Exploit, Issue Tracking, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/cebe/markdown/issues/166#issuecomment-508230493
Impacted products
Vendor Product Version
cebe markdown *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "source": "cve@mitre.org"
    }
  ],
  "configurations": [
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              "criteria": "cpe:2.3:a:cebe:markdown:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "4F59E405-8117-4402-B0EC-F246785DC7BA",
              "versionEndIncluding": "1.2.0",
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            }
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          "operator": "OR"
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  "cveTags": [
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      "sourceIdentifier": "cve@mitre.org",
      "tags": [
        "disputed"
      ]
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "PHP cebe markdown parser version 1.2.0 and earlier contains a Cross Site Scripting (XSS) vulnerability in all distributed parsers allowing a malicious crafted script to be executed that can result in the lose of user data and sensitive user information. This attack can be exploited by crafting a three backtick wrapped payload with a character in front: L: \"```\u003cscript\u003ealert();\u003c/script\u003e```\". NOTE: This has been argued as a non-issue (see references) since it is not the parser\u0027s job to sanitize malicious code from a parsed document"
    },
    {
      "lang": "es",
      "value": "** EN DISPUTA ** PHP cebe markdown parser, en versiones 1.2.0 y anteriores, contiene una vulnerabilidad Cross-Site Scripting (XSS) en todos los analizadores distribuidos que permite que un script maliciosamente manipulado se ejecute, lo que resulta en la p\u00e9rdida de datos y de informaci\u00f3n sensible del usuario. Este ataque puede explotarse manipulando una carga \u00fatil envuelta en tres acentos graves con un car\u00e1cter delante: L: \"``````\". NOTA: Esto se ha argumentado como un no-problema (ver referencias) ya que no es tarea del analizador sanear el c\u00f3digo malicioso de un documento analizado."
    }
  ],
  "id": "CVE-2018-1000874",
  "lastModified": "2026-06-17T01:33:13.763",
  "metrics": {
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        "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"
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        "exploitabilityScore": 8.6,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": true
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    "cvssMetricV30": [
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          "baseScore": 6.1,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
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          "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
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        "source": "nvd@nist.gov",
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    "cvssMetricV31": [
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          "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"
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        "exploitabilityScore": 2.8,
        "impactScore": 2.7,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
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    "ssvcV203": [
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2018-1000874",
          "options": [
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              "exploitation": "poc"
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            {
              "automatable": "no"
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            {
              "technicalImpact": "partial"
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          ],
          "role": "CISA Coordinator",
          "timestamp": "2025-04-23T13:31:08.425379Z",
          "version": "2.0.3"
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  "published": "2018-12-20T17:29:00.957",
  "references": [
    {
      "source": "cve@mitre.org",
      "tags": [
        "Exploit",
        "Issue Tracking",
        "Third Party Advisory"
      ],
      "url": "https://github.com/cebe/markdown/issues/166"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://github.com/cebe/markdown/issues/166#issuecomment-508230493"
    },
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      "url": "https://github.com/cebe/markdown/issues/166#issuecomment-508230493"
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  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Modified",
  "weaknesses": [
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      "description": [
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          "lang": "en",
          "value": "CWE-79"
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      "source": "nvd@nist.gov",
      "type": "Primary"
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          "lang": "en",
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      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}



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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.

Sightings

Author Source Type Date Other

Nomenclature

  • 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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.