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CVE-2020-15138

Estado: ModificadaAlta (7.5)—

Prism is vulnerable to Cross-Site Scripting. The easing preview of the Previewers plugin has an XSS vulnerability that allows attackers to execute arbitrary code in Safari and Internet Explorer. This impacts all Safari and Internet Explorer users of Prism >=v1.1.0 that use the _Previewers_ plugin (>=v1.10.0) or the _Previewer: Easing_ plugin (v1.1.0 to v1.9.0). This problem is fixed in version 1.21.0. To workaround the issue without upgrading, disable the easing preview on all impacted code blocks. You need Prism v1.10.0 or newer to apply this workaround.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Prismjs — Previewers

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2020-15138",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 2.6,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:H/Au:N/C:N/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "HIGH",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "LOW",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 4.9,
        "obtainUserPrivilege": false,
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    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.1,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:L",
          "integrityImpact": "HIGH",
          "userInteraction": "REQUIRED",
          "attackComplexity": "HIGH",
          "availabilityImpact": "LOW",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.5,
        "exploitabilityScore": 1.6
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      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:L",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "HIGH",
          "availabilityImpact": "LOW",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
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        "impactScore": 5.3,
        "exploitabilityScore": 1.6
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  "affected": [
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      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "PrismJS",
          "product": "prism",
          "versions": [
            {
              "status": "affected",
              "version": ">= 1.1.0, < 1.21.0"
            }
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        }
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  ],
  "published": "2020-08-07T17:15:10.450",
  "references": [
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      "url": "https://github.com/PrismJS/prism/pull/2506/commits/7bd7de05edf71112a3a77f87901a2409c9c5c20c",
      "tags": [
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      "url": "https://github.com/PrismJS/prism/security/advisories/GHSA-wvhm-4hhf-97x9",
      "tags": [
        "Third Party Advisory"
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      "source": "security-advisories@github.com"
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    {
      "url": "https://prismjs.com/plugins/previewers/#disabling-a-previewer",
      "tags": [
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      "url": "https://github.com/PrismJS/prism/pull/2506/commits/7bd7de05edf71112a3a77f87901a2409c9c5c20c",
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    {
      "url": "https://github.com/PrismJS/prism/security/advisories/GHSA-wvhm-4hhf-97x9",
      "tags": [
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    },
    {
      "url": "https://prismjs.com/plugins/previewers/#disabling-a-previewer",
      "tags": [
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      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
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      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
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          "lang": "en",
          "value": "CWE-79"
        }
      ]
    },
    {
      "type": "Primary",
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      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
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      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Prism is vulnerable to Cross-Site Scripting. The easing preview of the Previewers plugin has an XSS vulnerability that allows attackers to execute arbitrary code in Safari and Internet Explorer. This impacts all Safari and Internet Explorer users of Prism >=v1.1.0 that use the _Previewers_ plugin (>=v1.10.0) or the _Previewer: Easing_ plugin (v1.1.0 to v1.9.0). This problem is fixed in version 1.21.0. To workaround the issue without upgrading, disable the easing preview on all impacted code blocks. You need Prism v1.10.0 or newer to apply this workaround."
    },
    {
      "lang": "es",
      "value": "Prism es vulnerable a un ataque de tipo Cross-Site Scripting. La vista previa simplificada del plugin Previewers presenta una vulnerabilidad de tipo XSS que permite a atacantes ejecutar código arbitrario en Safari e Internet Explorer. Esto afecta a todos los usuarios de Safari e Internet Explorer de Prism versiones posteriores a v1.1.0 e incluyéndola, que utilizan el plugin _Previewers_ (versiones posteriores a v1.10.0 e incluyéndola) o el plugin _Previewer: Easing_ (versiones v1.1.0 hasta v1.9.0). Este problema es corregido en la versión 1.21.0. Para solucionar el problema sin actualizar, desactive la vista previa simplificada en todos los bloques de código afectados. Necesita Prism versión v1.10.0 o más reciente para aplicar esta solución"
    }
  ],
  "lastModified": "2026-06-17T02:56:07.577",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "criteria": "cpe:2.3:a:prismjs:previewers:*:*:*:*:*:prismjs:*:*",
              "vulnerable": true,
              "matchCriteriaId": "066FA9AE-722F-4905-8084-A42449E0A243",
              "versionEndExcluding": "1.21.0",
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      "operator": "AND"
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  "sourceIdentifier": "security-advisories@github.com"
}