CVE-2021-46743

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{"affected": [{"affectedData": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "source": "cve@mitre.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:google:firebase_php-jwt:*:*:*:*:*:*:*:*", "matchCriteriaId": "53E1DE57-9D25-4B98-83B6-C35BDD065D88", "versionEndExcluding": "6.0.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In Firebase PHP-JWT before 6.0.0, an algorithm-confusion issue (e.g., RS256 / HS256) exists via the kid (aka Key ID) header, when multiple types of keys are loaded in a key ring. This allows an attacker to forge tokens that validate under the incorrect key. NOTE: this provides a straightforward way to use the PHP-JWT library unsafely, but might not be considered a vulnerability in the library itself."}, {"lang": "es", "value": "En Firebase PHP-JWT versiones anteriores a 6.0.0, se presenta un problema de confusi\u00f3n de algoritmos (por ejemplo, RS256 / HS256) por medio del encabezado kid (tambi\u00e9n se conoce como Key ID), cuando son cargados varios tipos de claves en un llavero. Esto permite a un atacante falsificar tokens que son comprobados bajo la clave incorrecta. NOTA: esto proporciona una forma directa de usar la biblioteca PHP-JWT de forma no segura, pero podr\u00eda no considerarse una vulnerabilidad en la propia biblioteca"}], "id": "CVE-2021-46743", "lastModified": "2026-06-17T04:15:25.123", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 5.8, "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:N", "version": "2.0"}, "exploitabilityScore": 8.6, "impactScore": 4.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"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"}]}, "published": "2022-03-29T07:15:07.017", "references": [{"source": "cve@mitre.org", "tags": ["Exploit", "Third Party Advisory"], "url": "https://github.com/firebase/php-jwt/issues/351"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Third Party Advisory"], "url": "https://github.com/firebase/php-jwt/issues/351"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-843"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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