Access Control — Complete Deep Dive

Access Control — Complete Deep Dive is a skill for Claude Code, Codex from ShulkwiSEC/bb-huge. It costs 26 tokens per session (1,368 once invoked), scanned A, original, MIT.

A PortSwigger Web Security Academy guide for testing access-control weaknesses, where an application incorrectly lets users reach data or actions meant for someone else. It includes lab examples and request changes used to explore these flaws.

In plain words
What is it for?
Use it to test exposed admin pages, hidden URLs, role parameters, profile settings, filters, and related exploitation chains with tools such as Burp Suite.
Why use it?
It gives security learners a structured way to practice finding authorization mistakes and bypassing weak role checks. The guide is aimed at authorized labs, certification study, and bug bounty testing.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/shulkwisec/bb-huge/access-control
Any agent
npx skills add ShulkwiSEC/bb-huge --skill access-control
Clone the repo
git clone --depth 1 https://github.com/ShulkwiSEC/bb-huge

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 Access Control — Complete Deep Dive

README.md
[![agentmods](https://agentmods.dev/badge/skills/shulkwisec/bb-huge/access-control.svg)](https://agentmods.dev/skills/shulkwisec/bb-huge/access-control)
Your own site
<a href="https://agentmods.dev/skills/shulkwisec/bb-huge/access-control"><img src="https://agentmods.dev/badge/skills/shulkwisec/bb-huge/access-control.svg" alt="Measured on agentmods" 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 1,368 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. Scan, not verified.
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 $0.00026 $0.01368
Opus 5 $0.00013 $0.00684
Sonnet 5 $0.00005 $0.00274
Haiku 4.5 $0.00003 $0.00137

Measured 4d ago against content hash 66a689d2017f, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

Access Control — Complete 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 4d 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/access-control/SKILL.md · 169 lines

How it starts

The opening of the file, as written. The whole thing — 169 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Access Control — Complete 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: Unprotected admin 🟢 APPRENTICE

/robots.txt reveals /administrator-panel. Navigate directly.

Lab 2: Unpredictable URL admin 🟢 APPRENTICE

Check page source/JS for leaked admin URL: adminPanelTag.setAttribute('href', '/admin-abcd1234');

Lab 3: Role via request parameter 🟢 APPRENTICE

Cookie: session=xxx; Admin=true

Change Admin=false to Admin=true or roleid=2.

Lab 4: Role modified in profile 🟢 APPRENTICE

{"email":"[email protected]","roleid":2}

Add roleid to the profile update JSON request (mass assignment).

Lab 5: User ID in request param 🟢 APPRENTICE

GET /my-account?id=carlos HTTP/1.1

Lab 6: Unpredictable user IDs 🟡 PRACTITIONER

Find victim's GUID in blog posts/comments, then: /my-account?id=VICTIM-GUID.

Lab 7: Data leakage in redirect 🟡 PRACTITIONER

GET /my-account?id=carlos HTTP/1.1

Response body contains API key BEFORE the 302 redirect fires.

Lab 8: Password disclosure 🟡 PRACTITIONER

/my-account?id=administrator — password visible in masked input field (view source).

Lab 9: IDOR 🟢 APPRENTICE

GET /download-transcript/2.txt HTTP/1.1

Change 1.txt to 2.txt etc to download other users' chat transcripts.

Read the full file on GitHub · 169 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. 4d ago First seen · 169 lines · 26 tokens per session scan A 66a689d2017f

Subscribe to this mod's changes

Access Control — Complete Deep Dive is a skill published in the GitHub repository ShulkwiSEC/bb-huge (22 stars, last pushed 1mo ago), licensed MIT. It adds 26 tokens to every session and 1,368 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 2026-08-30.