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YukiIto1999
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testing-oauth2-implementation-flaws

Simulate OAuth2 and OpenID Connect attacks to detect security flaws.

Updated Apr 23, 2026
Search Tags:#oidc#oauth2#csrf#security-testing#token-security#pkce#redirect-uri
One-click install
npx skills add https://github.com/YukiIto1999/ctf-sleuth --skill testing-oauth2-implementation-flaws-yukiito1999
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: testing-oauth2-implementation-flaws
Source: https://github.com/YukiIto1999/ctf-sleuth/tree/main/.claude/skills/testing-oauth2-implementation-flaws
Command: npx skills add https://github.com/YukiIto1999/ctf-sleuth --skill testing-oauth2-implementation-flaws-yukiito1999

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires requests, and includes scripts (resource) and references (resource) components.

What problem does it solve?

OAuth2 and OpenID Connect implementations often have subtle security flaws that enable token theft, CSRF, or misconfigurations. This skill provides practical tests to evaluate these weaknesses in controlled environments, helping teams identify and remediate vulnerabilities before deployment.

Core Features & Use Cases

  • Redirect URI validation testing for open redirect and bypass techniques
  • CSRF protection testing via state parameter usage
  • PKCE enforcement testing for authorization code flow
  • Token handling, leakage risks, and scope management testing
  • OpenID Connect ID token validation weaknesses

Quick Start

Run the OAuth2 test agent against your OAuth2 provider to perform the listed tests and review the resulting report.

Frequently Asked Questions about testing-oauth2-implementation-flaws

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I test OAuth2 redirect URI validation for open redirect vulnerabilities?▼

Testing CSRF protection in OAuth2 involves verifying whether the state parameter is properly implemented and enforced during the authorization flow, preventing unauthorized access through simulated attacks in a controlled environment.

How does PKCE enforcement testing work for the OAuth2 authorization code flow?▼

PKCE enforcement testing checks whether your OAuth2 authorization code flow correctly mandates Proof Key for Code Exchange, ensuring that authorization codes cannot be intercepted or replayed by unauthorized parties.

Can I use this to test OpenID Connect ID token validation weaknesses?▼

You need a test environment with access to an authorization server and Python libraries including requests, secrets, and urllib to perform practical OAuth2 and OIDC attack simulations and generate a security findings report.

What is the best way to assess OAuth2 token handling and scope management risks?▼

The best way to assess OAuth2 token handling risks is to perform practical attack simulations that test token leakage, scope management, and validation weaknesses, yielding a comprehensive findings report for your web or mobile apps.

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