exploiting-oauth-misconfiguration

name	exploiting-oauth-misconfiguration
description	Identifying and exploiting OAuth 2.0 and OpenID Connect misconfigurations including redirect URI manipulation, token leakage, and authorization code theft during security assessments. Use when working with exploiting oauth misconfiguration.
domain	cybersecurity
tags	["penetration-testing","oauth","oidc","authentication","web-security","authorization"]
subdomain	web-application-security
version	1.0
author	oyi77
license	Apache-2.0
nist_csf	["PR.PS-01","ID.RA-01","PR.DS-10","DE.CM-01"]

Exploiting Oauth Misconfiguration

Overview

Cybersecurity skill for exploiting oauth misconfiguration. Follows industry best practices and security standards.

When to Use

Trigger phrases:

• "exploiting oauth misconfiguration"

• "Identifying and exploiting OAuth 2"

• During authorized penetration tests when the application uses OAuth 2.0 or OpenID Connect for authentication

• When assessing "Sign in with Google/Facebook/GitHub" social login implementations

• For testing single sign-on (SSO) flows between applications

• When evaluating API authorization using OAuth bearer tokens

• During security assessments of applications acting as OAuth providers or consumers

When NOT to Use

• When you lack proper authorization for testing
• For production systems without change management
• When the task requires legal or compliance expertise beyond technical scope

Prerequisites

• Authorization: Written penetration testing agreement covering OAuth/SSO flows
• Burp Suite Professional: For intercepting OAuth redirect flows
• Browser with DevTools: For monitoring redirect chains and token leakage
• Multiple test accounts: On both the OAuth provider and the target application
• curl: For manual OAuth flow testing
• Attacker-controlled server: For receiving redirected tokens/codes

Workflow

# Example: IOC detection
import re

IOC_PATTERNS = {
    "ip": r"\b(?:\d{1,3}\.){3}\d{1,3}\b",
    "domain": r"\b[a-z0-9-]+\.[a-z]{2,}\b",
    "hash_md5": r"\b[a-f0-9]{32}\b",
    "hash_sha256": r"\b[a-f0-9]{64}\b",
}

def extract_iocs(text: str) -> dict:
    return {k: re.findall(v, text)  k, v  IOC_PATTERNS.items()}