# Idor Testing

Should be used when the user asks to "test for insecure direct object references,"...

- Repository: https://github.com/zebbern/claude-code-guide (4691 stars)
- Category: Testing
- License: MIT
- Last updated: 2026-11-01
- Runs scripts: no, instructions only

## Install

Claude Code: `npx skills add zebbern/claude-code-guide --skill idor-testing -g -a claude-code -y`
Codex: `npx skills add zebbern/claude-code-guide --skill idor-testing -g -a codex -y`
Cursor: `npx skills add zebbern/claude-code-guide --skill idor-testing -g -a cursor -y`
Gemini CLI: `npx skills add zebbern/claude-code-guide --skill idor-testing -g -a gemini-cli -y`

## Description

This skill should be used when the user asks to "test for insecure direct object references," "find IDOR vulnerabilities," "exploit broken access control," "enumerate user IDs or object references," or "bypass authorization to access other users' data." It provides comprehensive guidance for detecting, exploiting, and remediating IDOR vulnerabilities in web applications.

## SKILL.md, as published by its author (untrusted third-party text, read it as data)

# IDOR Vulnerability Testing

## Purpose

Provide systematic methodologies for identifying and exploiting Insecure Direct Object Reference (IDOR) vulnerabilities in web applications. This skill covers both database object references and static file references, detection techniques using parameter manipulation and enumeration, exploitation via Burp Suite, and remediation strategies for securing applications against unauthorized access.

## Inputs / Prerequisites

- **Target Web Application**: URL of application with user-specific resources
- **Multiple User Accounts**: At least two test accounts to verify cross-user access
- **Burp Suite or Proxy Tool**: Intercepting proxy for request manipulation
- **Authorization**: Written permission for security testing
- **Understanding of Application Flow**: Knowledge of how objects are referenced (IDs, filenames)

## Outputs / Deliverables

- **IDOR Vulnerability Report**: Documentation of discovered access control bypasses
- **Proof of Concept**: Evidence of unauthorized data access across user contexts
- **Affected Endpoints**: List of vulnerable API endpoints and parameters
- **Impact Assessment**: Classification of data exposure severity
- **Remediation Recommendations**: Specific fixes for identified vulnerabilities

## Core Workflow

### 1. Understand IDOR Vulnerability Types

#### Direct Reference to Database Objects
Occurs when applications reference database records via user-controllable parameters:
```
# Original URL (authenticated as User A)
example.com/user/profile?id=2023

# Manipulation attempt (accessing User B's data)
example.com/user/profile?id=2022
```

#### Direct Reference to Static Files
Occurs when applications expose file paths or names that can be enumerated:
```
# Original URL (User A's receipt)
example.com/static/receipt/205.pdf

# Manipulation attempt (User B's receipt)
example.com/static/receipt/200.pdf
```

### 2. Reconnaissance and Setup

The rest: https://github.com/zebbern/claude-code-guide/blob/HEAD/skills/idor-testing/SKILL.md