Security Research

CVE-2023-46943 JWT Token Verification Bypass: from missing signature checks to identity spoofing

Thinking 2024-05-01 5 min read Research Dossier
#Vulnerability Analysis#Code Audit#Web Security
Dark dossier of JWT token structure and alg=none spoofing path

JWT libraries do not enforce signature checks by default — developers have to opt in. An attacker changes alg to none or swaps the key to bypass authentication directly.

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