Vulnerability Details CVE-2021-46743
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.01
EPSS Ranking 76.0%
CVSS Severity
CVSS v3 Score 9.1
CVSS v2 Score 5.8
References
Products affected by CVE-2021-46743
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cpe:2.3:a:google:firebase_php-jwt:-
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cpe:2.3:a:google:firebase_php-jwt:0.0.0
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cpe:2.3:a:google:firebase_php-jwt:1.0.0
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cpe:2.3:a:google:firebase_php-jwt:2.0.0
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cpe:2.3:a:google:firebase_php-jwt:2.1.0
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cpe:2.3:a:google:firebase_php-jwt:2.2.0
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cpe:2.3:a:google:firebase_php-jwt:3.0.0
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cpe:2.3:a:google:firebase_php-jwt:4.0.0
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cpe:2.3:a:google:firebase_php-jwt:5.0.0
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cpe:2.3:a:google:firebase_php-jwt:5.1.0
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cpe:2.3:a:google:firebase_php-jwt:5.2.0
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cpe:2.3:a:google:firebase_php-jwt:5.2.1
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cpe:2.3:a:google:firebase_php-jwt:5.3.0
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cpe:2.3:a:google:firebase_php-jwt:5.4.0
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cpe:2.3:a:google:firebase_php-jwt:5.5.0
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cpe:2.3:a:google:firebase_php-jwt:5.5.1