Cyber Exploiting Jwt Algorithm Confusion Attack

---
name: cyber-exploiting-jwt-algorithm-confusion-attack
description: "[LAB-GATED; discovery is not runtime authorization; offensive/dual-use — authorized-lab gate] Exploits JWT algorithm confusion vulnerabilities where the server''s token verification library accepts the algorithm specified in the JWT header rather than enforcing a fixed algorithm. The tester manipulates the alg header to switch from RS256 to HS256 (using the RSA public key as the HMAC secret), sets alg to none to bypass signature verification, or exploits kid/jku/x5u header injection to sup"
hide: true
---

<!-- GENERATED:YURI-CODEX-SKILL-ADAPTER:v1 -->

# YURI skill adapter

Authoritative source: `.claude/skills-labgated/cyber-exploiting-jwt-algorithm-confusion-attack/SKILL.md`

Authoritative source SHA-256: `50912dbe3e4bd53af4d5b515bfa0c74f778b6b4d9fedbf0bca62c577433035f8`

> AUTHORIZED-LAB ONLY. Offensive/dual-use capability. Use exclusively against systems you own or have explicit written authorization to test. Owner-authorized metadata discovery does not authorize runtime actions; use requires an explicit authorized-engagement decision.

Source class: `labgated`
Owner-authorized discovery: `true`
Runtime/action authorization: `false`
Risk gate (registry metadata): "offensive/dual-use — authorized-lab gate"

Discovery does not authorize execution. Obtain explicit current-task authorization before any offensive or dual-use action.

Before acting, read the authoritative source file above completely from beginning to end. If the governed source is absent, run `node _SYSTEM/Scripts/skill-recall.mjs --show cyber-exploiting-jwt-algorithm-confusion-attack` and read its complete verified output. Follow that source as the skill body; this adapter is a non-authoritative metadata-and-pointer projection.