GraphQL API — Deep Dive

GraphQL API — Deep Dive is a skill for Claude Code, Codex from ShulkwiSEC/bb-huge. It costs 26 tokens per session (1,051 once invoked), scanned A, original, MIT.

A detailed security testing guide for GraphQL APIs, including step-by-step examples for common training labs. GraphQL is an API style that lets clients request specific fields from connected data.

In plain words
What is it for?
Use it to practise GraphQL reconnaissance, test access controls, investigate exposed fields, and study multi-step vulnerability chains in approved environments.
Why use it?
It gives testers concrete examples for investigating hidden fields, private records, endpoint discovery, and protection bypasses. The material is aimed at controlled labs, bug bounty work, and authorized testing.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Needs its repository: it reads a path above its own folder, which exists only inside the repository. The line is - [`_shared/references/elite-chaining-strategy.md`](../_shared/references/elite-chaining-strategy.md) — Exploit chaining methodology and high-payout chain patte.

Good fit Use it to practise GraphQL reconnaissance, test access controls, investigate exposed fields, and study multi-step vulnerability chains in approved environments.

Compare 6 skills from other repositories ↓
Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo
git clone --depth 1 https://github.com/ShulkwiSEC/bb-huge
agentmods
npx agentmods add skills/shulkwisec/bb-huge/graphql-labs

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for GraphQL API — Deep Dive

README.md
[![agentmods](https://agentmods.dev/badge/skills/shulkwisec/bb-huge/graphql-labs/github.svg)](https://agentmods.dev/skills/shulkwisec/bb-huge/graphql-labs)
Your own site
<a href="https://agentmods.dev/skills/shulkwisec/bb-huge/graphql-labs"><img src="https://agentmods.dev/badge/skills/shulkwisec/bb-huge/graphql-labs/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for GraphQL API — Deep Dive

Your own site · 80×15
<a href="https://agentmods.dev/skills/shulkwisec/bb-huge/graphql-labs"><img src="https://agentmods.dev/badge/skills/shulkwisec/bb-huge/graphql-labs.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 26 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,051 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00026 $0.01051
Opus 5 $0.00013 $0.00526
Sonnet 5 $0.00005 $0.00210
Haiku 4.5 $0.00003 $0.00105

Measured 7d ago against content hash edbe8b2278ae, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

GraphQL API — Deep Dive scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 7d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/process.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

tools: [burp-suite, curl, sqlmap, ffuf, python, hashcat, ysoserial]
Origin

Copies of this mod

1 near-identical copy found in the catalogue:

skills/curated/graphql-labs/SKILL.md · 126 lines

How it starts

The opening of the file, as written. The whole thing — 126 lines — stays where its author put it; the contents beside it link to each section on GitHub.

GraphQL API — Deep Dive

Deep-Dive Lab Playbook — Every PortSwigger lab variant with exact payloads, bypass techniques, and zero-day extensions. 🟢 Apprentice 🟡 Practitioner 🔴 Expert

When to Use

  • BSCP certification prep
  • Real-world bug bounty hunting
  • Building exploitation chains
  • Understanding bypass techniques

Prerequisites

  • Burp Suite Professional
  • Burp Collaborator / interactsh
  • Browser with proxy configured

Workflow

Phase 1: Reconnaissance

  • Identify input vectors, parameters, and application behavior.

Phase 2: Exploitation

  • Apply standard lab payloads.

Phase 3: Zero-Day Escalation

  • Fuzz filters, bypass WAFs, and chain with other vulns.

Lab Playbooks

Lab 1: Accessing private posts 🟡 PRACTITIONER

{getBlogPost(id:3){id title postPassword}}

Query hidden postPassword field discovered via introspection.

Lab 2: Accidental field exposure 🟡 PRACTITIONER

Introspection → find User type → discover hidden field like password → query it.

Lab 3: Finding hidden endpoint 🟡 PRACTITIONER

Try: /graphql, /api, /api/graphql, /graphql/v1. Send universal query: {__typename}.

Lab 4: Bypass brute force protection 🟡 PRACTITIONER

mutation {
  login0:login(input:{username:"carlos",password:"123456"}){token}
  login1:login(input:{username:"carlos",password:"password"}){token}
  login2:login(input:{username:"carlos",password:"qwerty"}){token}
}

Batch aliases bypass per-request rate limiting.

Lab 5: CSRF over GraphQL 🟡 PRACTITIONER

Change Content-Type to application/x-www-form-urlencoded:

query=mutation{changeEmail(input:{email:"[email protected]"}){email}}

Form-encoded GraphQL bypasses CSRF protection that only checks JSON requests.

Blue Team Detection

  • Monitor access logs for anomalous payloads.
  • Implement strict input validation and parameterized queries where applicable.
  • Create WAF rules masking generic attack patterns.

Zero-Day Research

When standard technique fails:

  1. Identify the filter/WAF
  2. Fuzz with Burp Intruder custom wordlists
  3. Search GitHub/Twitter for new bypasses
  4. Chain with other vulns for escalation
  5. Try encoding variants: URL, double-URL, unicode, hex

Read the full file on GitHub · 126 lines

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 7d ago First seen · 126 lines · 26 tokens per session scan A edbe8b2278ae

Subscribe to this mod's changes

GraphQL API — Deep Dive is a skill published in the GitHub repository ShulkwiSEC/bb-huge (22 stars, last pushed 2mo ago), licensed MIT. It adds 26 tokens to every session and 1,051 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.