OAuth Hardening Specialist

Systematically audit and fortify OAuth 2.0 and OpenID Connect implementations against authorization code interception, redirect URI manipulation, token leakage, and scope escalation attacks using RFC-backed security best practices.

Gold

v1.0.00 activationsSecurityEngineeringexpert

SupaScore

83.55

Research Quality (15%)

8.5

Prompt Engineering (25%)

8.4

Practical Utility (15%)

8.3

Completeness (10%)

8.5

User Satisfaction (20%)

8.2

Decision Usefulness (15%)

8.3

Best for

▸Auditing OAuth 2.0 authorization code flows for redirect URI manipulation vulnerabilities
▸Implementing PKCE with S256 challenge method for single-page applications
▸Securing refresh token rotation with reuse detection in mobile apps
▸Validating JWT signature verification and preventing token leakage in API responses
▸Hardening OpenID Connect implementations against scope escalation attacks

What you'll get

●Detailed vulnerability assessment with specific RFC violations, exploit scenarios, and step-by-step remediation with code snippets for secure token storage
●Configuration checklist with exact redirect URI validation patterns, PKCE implementation code, and token lifecycle security controls
●Security architecture review identifying attack vectors with specific fixes including CORS policies, state parameter validation, and sender-constrained tokens

Not designed for ↓

×Basic authentication systems that don't use OAuth or OpenID Connect protocols
×General web application security beyond identity and authorization flows
×Setting up OAuth providers from scratch (focuses on hardening existing implementations)
×Non-OAuth SSO solutions like SAML or proprietary authentication systems

Expects

Existing OAuth 2.0 or OpenID Connect implementation details including flow types, client configurations, redirect URIs, token handling code, and current security measures.

Returns

Specific security vulnerabilities identified with RFC-backed remediation steps, configuration changes, and code examples to implement proper OAuth security controls.

Evidence Policy

Enabled: this skill cites sources and distinguishes evidence from opinion.

oauthoidcauthenticationtoken-securitypkceauthorizationidentityapi-securityjwtrefresh-tokensredirect-urifapi

Research Foundation: 8 sources (5 official docs, 1 books, 1 web, 1 academic)

This skill was developed through independent research and synthesis. SupaSkills is not affiliated with or endorsed by any cited author or organisation.

Version History

v1.0.02/16/2026

Initial release

Works well with

API Security HardenerGold Authentication & Authorization ArchitectGold Penetration Testing GuideGold Security Code ReviewerGold WebAuthn Passkey EngineerGold

Need more depth?

Specialist skills that go deeper in areas this skill touches.

Zero Trust Access PatternsGold Identity Governance ArchitectGold

Common Workflows

API Security Audit Pipeline

Comprehensive API security assessment starting with OAuth/OIDC hardening, followed by broader API security review and penetration testing validation

oauth-hardening-specialist→API Security Hardener→Penetration Testing Guide

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