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web-auth-jwt

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skills/web/web-auth-jwt/SKILL.md

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# JWT / token authentication attacks

## When it applies
The app authenticates with a JSON Web Token and trusts claims inside it (user id, role,
`isAdmin`). The win is forging a valid-looking token the server accepts.

## Why it works
JWTs are only as safe as their signature verification. Implementations routinely skip it,
confuse algorithms, or trust attacker-controlled key hints (`kid`, `jku`, `x5u`). If you can
make the server accept a signature you produced, you own every claim.

## Method
> **Payloads & full variation set:** [`cheatsheet.md`](cheatsheet.md) next to this file — work the set, not the first line.
1. **Decode & read claims**: `jwt_tool <token>` — look for `role`, `admin`, `sub`, weak `exp`.
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