Api Auth And Jwt Abuse

OrganizationPopular

yaklang

api-auth-and-jwt-abuse

API authentication and JWT abuse playbook. Use when testing bearer tokens, API keys, claim trust, header spoofing, rate limits, and API auth boundary weaknesses.

Overview

Publisher	yaklang
Repository	`hack-skills`
Skill name	`api-auth-and-jwt-abuse`
Stars	2.2K
Forks	292
Bundled files	Instructions only
License	MIT
Links	Skill source Repository

Markdown instructions
A SKILL.md file the model loads on demand, so it only costs tokens when a request actually matches.
Works with any LLM
AI skills are plain Markdown, not provider-specific code, so this works with GPT, Claude, Gemini, Grok, or a local model.
Self-contained
Everything the model needs lives in the instructions — no extra files to sync.
Open source
Published by yaklang on GitHub. Read the source before you install it.

Installation

Install the Api Auth And Jwt Abuse AI skill in TypingMind to use it with any LLM, or drop it into another agent that reads SKILL.md.

Install in TypingMind

TypingMind installs a skill straight from its GitHub folder — it reads SKILL.md, bundles the resource files, and stores the result locally.

Open the app and go to Plugins → Skills.
Choose "Install from GitHub".
Paste the skill folder URL below and confirm.
Enable the skill in any chat where you want it available.

Plugins → Skills → Add skill → From GitHub URL, then paste the folder URL and press Continue.

Install in another agent

Any agent that reads the Agent Skills format can use this skill — copy the folder into that agent's skills directory.

Claude Code — .claude/skills

git clone --depth 1 https://github.com/yaklang/hack-skills.git /tmp/hack-skills
mkdir -p .claude/skills
cp -r /tmp/hack-skills/skills/api-auth-and-jwt-abuse .claude/skills/api-auth-and-jwt-abuse

Restart Claude Code after copying so it picks up the new skill.

Use it in TypingMind

Enable Api Auth And Jwt Abuse in any TypingMind chat and the model takes it from there. Its name and description sit in the system prompt, and the moment a request matches, the model loads the full instructions itself — you never invoke it by hand, and it costs no tokens until it is actually used.

The model loads Api Auth And Jwt Abuse on its own as soon as a request matches it.

Works with any AI model

AI skills are plain Markdown instructions rather than provider-specific code, so Api Auth And Jwt Abuse is not tied to the model it was written for. Install it once in TypingMind and use it with GPT-5, Claude, Gemini, Grok, DeepSeek, Mistral, Llama, or a local model you run yourself — all on your own API keys.

Loaded only when it is needed
The system prompt carries just the name and description. The instructions are fetched on the first matching request, so an idle skill costs nothing.
Switch models mid-chat
Because the skill is instructions rather than code, changing model does not break it — the next model reads the same SKILL.md.

Skill instructions

This is the SKILL.md content the model loads. Read it before installing — a skill is instructions your model will follow.

SKILL: API Auth and JWT Abuse — Token Trust, Header Tricks, and Rate Limits

AI LOAD INSTRUCTION: Use this skill when APIs rely on JWT, bearer tokens, API keys, or weak request identity signals. Focus on token trust boundaries, claim misuse, header spoofing, and rate-limit bypass.

1. TOKEN TRIAGE

Inspect:

alg, kid, jku, x5u
role, org, tenant, scope, or privilege claims
issuer and audience mismatches
reuse of mobile and web tokens across products

2. QUICK ATTACK PICKS

Pattern	First Test
`alg:none` acceptance	unsigned token with trailing dot
RS256 confusion	switch to HS256 using public key as secret
`kid` lookup trust	path traversal or injection in `kid`
remote key fetch trust	attacker-controlled `jku` or `x5u`
weak secret	offline crack with targeted wordlists

3. HIDDEN FIELDS AND BATCH ABUSE

Mass assignment field picks

text
role
isAdmin
admin
verified
plan
tier
permissions
org
owner

Rate limit and batch abuse picks

text
X-Forwarded-For: 1.2.3.4
X-Real-IP: 5.6.7.8
Forwarded: for=9.9.9.9

GraphQL or JSON batch abuse candidates:

arrays of login mutations
bulk object fetches with varying IDs
repeated password reset or verification calls in one request

4. RATE LIMIT BYPASS FAMILIES

text
X-Forwarded-For
X-Real-IP
Forwarded
User-Agent rotation
Path case / slash variants

5. NEXT ROUTING

For GraphQL batching and hidden parameters: graphql and hidden parameters
For default credential and brute-force planning: authentication bypass
For full JWT and OAuth depth: jwt oauth token attacks
For OAuth or OIDC configuration flaws in browser and SSO flows: oauth oidc misconfiguration
For credentialed browser reads and origin trust bugs: cors cross origin misconfiguration

Frequently asked questions

What does the Api Auth And Jwt Abuse AI skill do?

API authentication and JWT abuse playbook. Use when testing bearer tokens, API keys, claim trust, header spoofing, rate limits, and API auth boundary weaknesses.

Why use Api Auth And Jwt Abuse on TypingMind?

Because you install it once and use it with any model. Api Auth And Jwt Abuse is plain Markdown rather than provider-specific code, so the same skill runs on GPT-5, Claude, Gemini, Grok, or a local model — and you can switch model mid-chat without it breaking. TypingMind runs on your own API keys, so you pay providers directly instead of a per-seat subscription, and your skills and chats stay in your own storage.

How do I install Api Auth And Jwt Abuse in TypingMind?

Open Plugins → Skills → Install from GitHub in TypingMind and paste https://github.com/yaklang/hack-skills/tree/main/skills/api-auth-and-jwt-abuse. TypingMind reads its SKILL.md and installs it as a skill you can enable per chat.

Which AI models can use Api Auth And Jwt Abuse?

Any model you connect in TypingMind. AI skills are plain Markdown instructions rather than provider-specific code, so GPT, Claude, Gemini, Grok, and local models can all load this skill when a request matches it.

How many AI models can I use with Api Auth And Jwt Abuse?

As many as you like. As long as a model supports skills, you can use Api Auth And Jwt Abuse with it — GPT, Claude, Gemini, Grok, DeepSeek, Mistral, Llama and more — all on TypingMind with your own API keys.

Is the Api Auth And Jwt Abuse AI skill free?

Yes. It is published on GitHub by yaklang under the MIT license. You only pay your own AI provider for the tokens you use.

What are AI skills?

An AI skill is a reusable instruction bundle that teaches an AI model how to do one specific task. It follows the open Agent Skills format: a SKILL.md file with a name and description, plus any scripts, templates or reference files the model may need. The model reads the instructions only when your request matches the skill, so an installed skill costs nothing until it is used.

How are AI skills different from plugins or MCP servers?

A plugin or MCP server gives a model new tools to call — code that runs somewhere and returns a result. An AI skill gives the model knowledge and process instead: how to approach a task, which steps to follow, what good output looks like. Skills are plain Markdown, so they need no server, no API key and no runtime, and they work with any model.

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Overview

Installation

Install in TypingMind

Install in another agent

Use it in TypingMind

Works with any AI model

Skill instructions

SKILL: API Auth and JWT Abuse — Token Trust, Header Tricks, and Rate Limits

1. TOKEN TRIAGE

2. QUICK ATTACK PICKS

3. HIDDEN FIELDS AND BATCH ABUSE

Mass assignment field picks

Rate limit and batch abuse picks

4. RATE LIMIT BYPASS FAMILIES

5. NEXT ROUTING

Frequently asked questions

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