Module 29 · Advanced JWT Attacks — Beyond Algorithm Confusion

Manish Garg
Manish Garg Associate of (ISC)² · RingSafe
May 14, 2026
3 min read
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Last updated: May 18, 2026

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Why this module exists. JWT attacks go beyond the classic algorithm-confusion (alg=none, alg=HS256 with public-key). Modern JWT attacks include key-confusion via JWK Set, JKU header injection, KID parameter injection, and weakness in JWE encrypted tokens. This module covers the advanced techniques.

Beyond alg=none and HS256 confusion

Module SC-4 covered the classic algorithm-confusion attacks. This module covers the advanced variants.

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