fkie_cve-2023-46251
Vulnerability from fkie_nvd
Published
2023-11-06 18:15
Modified
2024-11-21 08:28
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:H/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
MyBB is a free and open source forum software. Custom MyCode (BBCode) for the visual editor (_SCEditor_) doesn't escape input properly when rendering HTML, resulting in a DOM-based XSS vulnerability. This 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. The impact is be mitigated when: 1. the visual editor is disabled globally (_Admin CP → Configuration → Settings → Clickable Smilies and BB Code: [Clickable MyCode Editor](https://github.com/mybb/mybb/blob/mybb_1836/install/resources/settings.xml#L2087-L2094)_ is set to _Off_), or 2. the visual editor is disabled for individual user accounts (_User CP → Your Profile → Edit Options_: _Show the MyCode formatting options on the posting pages_ checkbox is not checked). MyBB 1.8.37 resolves this issue with the commit `6dcaf0b4d`. Users are advised to upgrade. Users unable to upgrade may mitigate the impact without upgrading MyBB by changing the following setting (_Admin CP → Configuration → Settings_): - _Clickable Smilies and BB Code → [Clickable MyCode Editor](https://github.com/mybb/mybb/blob/mybb_1836/install/resources/settings.xml#L2087-L2094)_: _Off_. Similarly, individual MyBB forum users are able to disable the visual editor by diabling the account option (_User CP → Your Profile → Edit Options_) _Show the MyCode formatting options on the posting pages_.
References
security-advisories@github.comhttps://github.com/mybb/mybb/commit/6dcaf0b4db6254f1833fe8dae295d9ddc2219276Patch
security-advisories@github.comhttps://github.com/mybb/mybb/security/advisories/GHSA-wj33-q7vj-9fr8Vendor Advisory
security-advisories@github.comhttps://mybb.com/versions/1.8.37/Release Notes
af854a3a-2127-422b-91ae-364da2661108https://github.com/mybb/mybb/commit/6dcaf0b4db6254f1833fe8dae295d9ddc2219276Patch
af854a3a-2127-422b-91ae-364da2661108https://github.com/mybb/mybb/security/advisories/GHSA-wj33-q7vj-9fr8Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://mybb.com/versions/1.8.37/Release Notes
Impacted products
Vendor Product Version
mybb mybb *


To clipboard 

{
   configurations: [
      {
         nodes: [
            {
               cpeMatch: [
                  {
                     criteria: "cpe:2.3:a:mybb:mybb:*:*:*:*:*:*:*:*",
                     matchCriteriaId: "EC8DBC6D-0D47-46D6-A840-36BF42F37437",
                     versionEndExcluding: "1.8.37",
                     vulnerable: true,
                  },
               ],
               negate: false,
               operator: "OR",
            },
         ],
      },
   ],
   cveTags: [],
   descriptions: [
      {
         lang: "en",
         value: " MyBB is a free and open source forum software. Custom MyCode (BBCode) for the visual editor (_SCEditor_) doesn't escape input properly when rendering HTML, resulting in a DOM-based XSS vulnerability. This 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. The impact is be mitigated when: 1. the visual editor is disabled globally (_Admin CP → Configuration → Settings → Clickable Smilies and BB Code: [Clickable MyCode Editor](https://github.com/mybb/mybb/blob/mybb_1836/install/resources/settings.xml#L2087-L2094)_ is set to _Off_), or 2. the visual editor is disabled for individual user accounts (_User CP → Your Profile → Edit Options_: _Show the MyCode formatting options on the posting pages_ checkbox is not checked). MyBB 1.8.37 resolves this issue with the commit `6dcaf0b4d`. Users are advised to upgrade. Users unable to upgrade may mitigate the impact without upgrading MyBB by changing the following setting (_Admin CP → Configuration → Settings_):\n- _Clickable Smilies and BB Code → [Clickable MyCode Editor](https://github.com/mybb/mybb/blob/mybb_1836/install/resources/settings.xml#L2087-L2094)_: _Off_. Similarly, individual MyBB forum users are able to disable the visual editor by diabling the account option (_User CP → Your Profile → Edit Options_) _Show the MyCode formatting options on the posting pages_.",
      },
      {
         lang: "es",
         value: "MyBB es un software de foro gratuito y de código abierto. El MyCode personalizado (BBCode) para el editor visual (_SCEditor_) no sanitiza la entrada correctamente al representar HTML, lo que genera una vulnerabilidad XSS basada en DOM. Esta debilidad se puede explotar dirigiendo a la víctima a una página donde el editor visual está activo (por ejemplo, como una publicación o mensaje privado) y opera con un mensaje MyCode creado con fines malintencionados. Esto puede ocurrir en páginas donde el contenido del mensaje se completa previamente mediante un parámetro GET/POST, o en páginas de respuesta donde se cita un mensaje malicioso previamente guardado. El impacto se mitiga cuando: \n1. el editor visual está deshabilitado globalmente (_Admin CP ? Configuration ? Settings ? Clickable Smilies and BB Code: [Clickable MyCode Editor](https://github.com/mybb/mybb/blob/mybb_1836/install/resources/settings.xml#L2087-L2094)_ is set to _Off_), o \n2. el editor visual está deshabilitado para cuentas de usuario individuales (_User CP ? Your Profile ? Edit Options_: _Show the MyCode formatting options on the posting pages_ checkbox is not checked).\nMyBB 1.8.37 resuelve este problema con el commit `6dcaf0b4d`. Se recomienda a los usuarios que actualicen. Los usuarios que no puedan actualizar pueden mitigar el impacto sin actualizar MyBB cambiando la siguiente configuración (_Admin CP ? Configuration ? Settings_): - _Clickable Smilies and BB Code ? [Clickable MyCode Editor](https://github.com/mybb/mybb/blob/mybb_1836/install/resources/settings.xml#L2087-L2094)_: _Off_. \nDe manera similar, los usuarios individuales del foro MyBB pueden desactivar el editor visual marcando la opción de cuenta (_User CP ? Your Profile ? Edit Options_)_Show the MyCode formatting options on the posting pages_.",
      },
   ],
   id: "CVE-2023-46251",
   lastModified: "2024-11-21T08:28:10.273",
   metrics: {
      cvssMetricV31: [
         {
            cvssData: {
               attackComplexity: "HIGH",
               attackVector: "NETWORK",
               availabilityImpact: "HIGH",
               baseScore: 7.5,
               baseSeverity: "HIGH",
               confidentialityImpact: "HIGH",
               integrityImpact: "HIGH",
               privilegesRequired: "NONE",
               scope: "UNCHANGED",
               userInteraction: "REQUIRED",
               vectorString: "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
               version: "3.1",
            },
            exploitabilityScore: 1.6,
            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: "2023-11-06T18:15:08.547",
   references: [
      {
         source: "security-advisories@github.com",
         tags: [
            "Patch",
         ],
         url: "https://github.com/mybb/mybb/commit/6dcaf0b4db6254f1833fe8dae295d9ddc2219276",
      },
      {
         source: "security-advisories@github.com",
         tags: [
            "Vendor Advisory",
         ],
         url: "https://github.com/mybb/mybb/security/advisories/GHSA-wj33-q7vj-9fr8",
      },
      {
         source: "security-advisories@github.com",
         tags: [
            "Release Notes",
         ],
         url: "https://mybb.com/versions/1.8.37/",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         tags: [
            "Patch",
         ],
         url: "https://github.com/mybb/mybb/commit/6dcaf0b4db6254f1833fe8dae295d9ddc2219276",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         tags: [
            "Vendor Advisory",
         ],
         url: "https://github.com/mybb/mybb/security/advisories/GHSA-wj33-q7vj-9fr8",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         tags: [
            "Release Notes",
         ],
         url: "https://mybb.com/versions/1.8.37/",
      },
   ],
   sourceIdentifier: "security-advisories@github.com",
   vulnStatus: "Modified",
   weaknesses: [
      {
         description: [
            {
               lang: "en",
               value: "CWE-79",
            },
         ],
         source: "security-advisories@github.com",
         type: "Primary",
      },
   ],
}


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