CVE-2026-41691

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When an application exposes the language-code selection to user-controlled input (the default \u2014 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 \u2014 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 a\u00f1ade internacionalizaci\u00f3n de sitios web a trav\u00e9s de una etiqueta de script, sin cambios en el c\u00f3digo 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 codificaci\u00f3n, validaci\u00f3n o saneamiento de ruta. Cuando una aplicaci\u00f3n expone la selecci\u00f3n de c\u00f3digo de idioma a una entrada controlada por el usuario (el valor predeterminado - i18next-browser-languagedetector lee los par\u00e1metros 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 inyecci\u00f3n de URL \u00fanica. 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 inyecci\u00f3n de estructura de URL m\u00e1s amplia - ambos se cierran con la \u00fanica correcci\u00f3n de saneamiento de interpolateUrl. Este problema ha sido solucionado en la versi\u00f3n 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)."}], "id": "CVE-2026-41691", "lastModified": "2026-10-26T20:10:00.160", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 2.5, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 9.1, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.2, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-41691", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-05-08T13:08:33.422781Z", "version": "2.0.3"}}]}, "published": "2026-05-07T21:16:29.560", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/i18next/i18next-http-backend/commit/4cee84f229c637b9c182366d3156f726d407a621"}, {"source": "security-advisories@github.com", "tags": ["Mitigation", "Vendor Advisory"], "url": "https://github.com/i18next/i18next-http-backend/security/advisories/GHSA-q89c-q3h5-w34g"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-22"}, {"lang": "en", "value": "CWE-74"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

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