CVE-2026-41238

{
  "id": "CVE-2026-41238",
  "sourceIdentifier": "[email protected]",
  "published": "2026-04-23T16:16:26.420",
  "lastModified": "2026-10-26T22:10:00.163",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Versions 3.0.1 through 3.3.3 are vulnerable to a prototype pollution-based XSS bypass. When an application uses `DOMPurify.sanitize()` with the default configuration (no `CUSTOM_ELEMENT_HANDLING` option), a prior prototype pollution gadget can inject permissive `tagNameCheck` and `attributeNameCheck` regex values into `Object.prototype`, causing DOMPurify to allow arbitrary custom elements with arbitrary attributes — including event handlers — through sanitization. Version 3.4.0 fixes the issue."
    },
    {
      "lang": "es",
      "value": "DOMPurify es un saneador de cross-site scripting solo para DOM para HTML, MathML y SVG. Las versiones 3.0.1 a 3.3.3 son vulnerables a un bypass de XSS basado en contaminación de prototipos. Cuando una aplicación utiliza DOMPurify.sanitize() con la configuración predeterminada (sin la opción CUSTOM_ELEMENT_HANDLING), un gadget de contaminación de prototipos previo puede inyectar valores regex permisivos de tagNameCheck y attributeNameCheck en Object.prototype, haciendo que DOMPurify permita elementos personalizados arbitrarios con atributos arbitrarios -incluidos los manejadores de eventos- a través de la sanitización. La versión 3.4.0 corrige el problema."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "cure53",
          "product": "DOMPurify",
          "versions": [
            {
              "version": ">= 3.0.1, < 3.4.0",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N",
          "baseScore": 6.9,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "HIGH",
          "privilegesRequired": "NONE",
          "userInteraction": "REQUIRED",
          "scope": "CHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "LOW",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 1.6,
        "impactScore": 4.7
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-04-23T16:20:12.329842Z",
          "id": "CVE-2026-41238",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        },
        {
          "lang": "en",
          "value": "CWE-1321"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/cure53/DOMPurify/releases/tag/3.4.0",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/cure53/DOMPurify/security/advisories/GHSA-v9jr-rg53-9pgp",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/cure53/DOMPurify/security/advisories/GHSA-v9jr-rg53-9pgp",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ]
}