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    2 vulnerabilities by joaquimserafim

    CVE-2023-48238 (GCVE-0-2023-48238)

    Vulnerability from nvd – Published: 2023-11-17 21:35 – Updated: 2026-06-08 23:38
    VLAI
    Title
    JWT Algorithm Confusion in json-web-token library
    Summary
    joaquimserafim/json-web-token is a javascript library use to interact with JSON Web Tokens (JWT) which are a compact URL-safe means of representing claims to be transferred between two parties. Versions prior to 4.0.0 are vulnerable to a JWT algorithm confusion attack. On line 86 of the 'index.js' file, the algorithm to use for verifying the signature of the JWT token is taken from the JWT token, which at that point is still unverified and thus shouldn't be trusted. To exploit this vulnerability, an attacker needs to craft a malicious JWT token containing the HS256 algorithm, signed with the public RSA key of the victim application. This attack will only work against this library is the RS256 algorithm is in use, however it is a best practice to use that algorithm. Version 4.0.0 fixes the issue.
    Severity
    7.5 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
    SSVC
    Exploitation: poc Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-345 - Insufficient Verification of Data Authenticity
    Assigner
    References
    Impacted products
    Show details on NVD website
    To clipboard 

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    CVE-2023-48238 (GCVE-0-2023-48238)

    Vulnerability from cvelistv5 – Published: 2023-11-17 21:35 – Updated: 2026-06-08 23:38
    VLAI
    Title
    JWT Algorithm Confusion in json-web-token library
    Summary
    joaquimserafim/json-web-token is a javascript library use to interact with JSON Web Tokens (JWT) which are a compact URL-safe means of representing claims to be transferred between two parties. Versions prior to 4.0.0 are vulnerable to a JWT algorithm confusion attack. On line 86 of the 'index.js' file, the algorithm to use for verifying the signature of the JWT token is taken from the JWT token, which at that point is still unverified and thus shouldn't be trusted. To exploit this vulnerability, an attacker needs to craft a malicious JWT token containing the HS256 algorithm, signed with the public RSA key of the victim application. This attack will only work against this library is the RS256 algorithm is in use, however it is a best practice to use that algorithm. Version 4.0.0 fixes the issue.
    Severity
    7.5 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
    SSVC
    Exploitation: poc Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-345 - Insufficient Verification of Data Authenticity
    Assigner
    References
    Impacted products
    Show details on NVD website
    To clipboard 

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