dev.to· Oct 7, 2026· by devomnitools

Why Decoding a JWT Is Not Verifying It (And How Security Bugs Slip Through)

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In an algorithm confusion attack, an attacker takes your public key (which is publicly accessible),...
🎯 Vulnerability: OAuth 2.0 / JWT Authentication Bypass
💡 Defense Fix: Strictly verify JWT signatures on the backend, enforce state parameter validation, and reject 'alg: none'.
#security#webdev#javascript#backend