FKIE_CVE-2020-15139

Vulnerability from fkie_nvd - Published: 2020-08-10 22:15 - Updated: 2024-11-21 05:04
Severity
8.8 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.1 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Summary
In MyBB before version 1.8.24, the custom MyCode (BBCode) for the visual editor doesn't escape input properly when rendering HTML, resulting in a DOM-based XSS vulnerability. The weakness can be exploited by pointing a victim to a page where the visual editor is active (e.g. as a post or Private Message) and operates on a maliciously crafted MyCode message. This may occur on pages where message content is pre-filled using a GET/POST parameter, or on reply pages where a previously saved malicious message is quoted. After upgrading MyBB to 1.8.24, make sure to update the version attribute in the `codebuttons` template for non-default themes to serve the latest version of the patched `jscripts/bbcodes_sceditor.js` file.
References
security-advisories@github.comhttps://github.com/mybb/mybb/commit/37ad29dcd25489a37bdd89ebac761f22492558b0Patch, Third Party Advisory
security-advisories@github.comhttps://github.com/mybb/mybb/security/advisories/GHSA-37h7-vfv6-f8rjPatch, Third Party Advisory
security-advisories@github.comhttps://mybb.com/versions/1.8.24/Patch, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/mybb/mybb/commit/37ad29dcd25489a37bdd89ebac761f22492558b0Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/mybb/mybb/security/advisories/GHSA-37h7-vfv6-f8rjPatch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://mybb.com/versions/1.8.24/Patch, Vendor Advisory
Impacted products
Vendor Product Version
mybb mybb *
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:mybb:mybb:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "C4357014-50F7-4CE1-A839-1853651C2685",
              "versionEndExcluding": "1.8.24",
              "vulnerable": true
            }
          ],
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          "operator": "OR"
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In MyBB before version 1.8.24, the custom MyCode (BBCode) for the visual editor doesn\u0027t escape input properly when rendering HTML, resulting in a DOM-based XSS vulnerability. The weakness can be exploited by pointing a victim to a page where the visual editor is active (e.g. as a post or Private Message) and operates on a maliciously crafted MyCode message. This may occur on pages where message content is pre-filled using a GET/POST parameter, or on reply pages where a previously saved malicious message is quoted. After upgrading MyBB to 1.8.24, make sure to update the version attribute in the `codebuttons` template for non-default themes to serve the latest version of the patched `jscripts/bbcodes_sceditor.js` file."
    },
    {
      "lang": "es",
      "value": "En MyBB anterior a la versi\u00f3n 1.8.24, el MyCode (BBCode) personalizado para el editor visual no escapa la entrada correctamente cuando renderiza HTML, lo que genera una vulnerabilidad de tipo XSS basada en DOM. La debilidad puede ser explotada se\u00f1alando a la v\u00edctima a una p\u00e1gina donde el editor visual est\u00e1 activo (por ejemplo, como una publicaci\u00f3n o un Mensaje Privado) y opera en un mensaje MyCode dise\u00f1ado con fines maliciosos. Esto puede ocurrir en p\u00e1ginas donde el contenido del mensaje se rellena previamente usando un par\u00e1metro GET/POST, o en p\u00e1ginas de respuesta donde un mensaje malicioso previamente guardado es citado. Despu\u00e9s de actualizar MyBB a la versi\u00f3n 1.8.24, aseg\u00farese de actualizar el atributo de versi\u00f3n en la plantilla \"codebuttons\" para que los temas no predeterminados sirvan la \u00faltima versi\u00f3n del archivo \"jscripts/bbcodes_sceditor.js\" parcheado"
    }
  ],
  "id": "CVE-2020-15139",
  "lastModified": "2024-11-21T05:04:55.650",
  "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": "HIGH",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.9,
        "source": "security-advisories@github.com",
        "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": "2020-08-10T22:15:14.223",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/mybb/mybb/commit/37ad29dcd25489a37bdd89ebac761f22492558b0"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
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      "url": "https://github.com/mybb/mybb/security/advisories/GHSA-37h7-vfv6-f8rj"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
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        "Vendor Advisory"
      ],
      "url": "https://mybb.com/versions/1.8.24/"
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    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
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      "tags": [
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    },
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      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
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        "Vendor Advisory"
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      "url": "https://mybb.com/versions/1.8.24/"
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  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    },
    {
      "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.

Sightings

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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.