CVE-2026-41691

{
  "id": "CVE-2026-41691",
  "sourceIdentifier": "[email protected]",
  "published": "2026-05-07T21:16:29.560",
  "lastModified": "2026-10-26T20:10:00.160",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Copilot said: i18nextify is a JavaScript library that adds\ni18nextify is a JavaScript library that adds website internationalization via a script tag, without source code changes. Versions prior to 3.0.5 interpolate the lng and ns values directly into the configured loadPath / addPath URL template without any encoding, validation, or path sanitisation. When an application exposes the language-code selection to user-controlled input (the default — i18next-browser-languagedetector reads ?lng= query params, cookies, localStorage, and request headers), an attacker can inject characters that change the structure of the outgoing request URL. This is a single URL-injection vulnerability. The attacker-controlled value is neutralised before it is used as part of an output URL string; the attack shape covers both path traversal and broader URL-structure injection — both are closed by the one interpolateUrl sanitisation fix. This issue has been fixed in version 3.0.5. If users cannot upgrade immediately, they can work around the issue by sanitising lng / ns before they reach i18next (strip .., /, \\, ?, #, %, whitespace, and control characters; cap the length)."
    },
    {
      "lang": "es",
      "value": "Copilot dijo: i18nextify es una biblioteca de JavaScript que añade internacionalización de sitios web a través de una etiqueta de script, sin cambios en el código fuente. Las versiones anteriores a la 3.0.5 interpolan los valores lng y ns directamente en la plantilla de URL loadPath / addPath configurada sin ninguna codificación, validación o saneamiento de ruta. Cuando una aplicación expone la selección de código de idioma a una entrada controlada por el usuario (el valor predeterminado - i18next-browser-languagedetector lee los parámetros de consulta ?lng=, cookies, localStorage y encabezados de solicitud), un atacante puede inyectar caracteres que cambian la estructura de la URL de la solicitud saliente. Esta es una vulnerabilidad de inyección de URL única. El valor controlado por el atacante se neutraliza antes de ser utilizado como parte de una cadena de URL de salida; la forma del ataque cubre tanto el salto de ruta como la inyección de estructura de URL más amplia - ambos se cierran con la única corrección de saneamiento de interpolateUrl. Este problema ha sido solucionado en la versión 3.0.5. Si los usuarios no pueden actualizar inmediatamente, pueden solucionar el problema saneando lng / ns antes de que lleguen a i18next (eliminar .., /, \\, ?, #, %, espacios en blanco y caracteres de control; limitar la longitud)."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "i18next",
          "product": "i18next-http-backend",
          "versions": [
            {
              "version": "< 3.0.5",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 2.5
      },
      {
        "source": "[email protected]",
        "type": "Primary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
          "baseScore": 9.1,
          "baseSeverity": "CRITICAL",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.2
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-05-08T13:08:33.422781Z",
          "id": "CVE-2026-41691",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        },
        {
          "lang": "en",
          "value": "CWE-74"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:i18next:i18next-http-backend:*:*:*:*:*:node.js:*:*",
              "versionEndExcluding": "3.0.5",
              "matchCriteriaId": "AF30D3E4-BC7C-4059-98B4-CB275ED97573"
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  "references": [
    {
      "url": "https://github.com/i18next/i18next-http-backend/commit/4cee84f229c637b9c182366d3156f726d407a621",
      "source": "[email protected]",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://github.com/i18next/i18next-http-backend/security/advisories/GHSA-q89c-q3h5-w34g",
      "source": "[email protected]",
      "tags": [
        "Mitigation",
        "Vendor Advisory"
      ]
    }
  ]
}