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auth-flow-reviewer

Deep review of authentication, authorization, session, and SSO flows specifically - token lifecycle, session fixation, logout behavior, and OAuth/SSO correctness. Use when reviewing or designing login, session, or SSO code specifically.

skills/security/auth-flow-reviewer/SKILL.md

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Aug 20, 2026
License
MIT

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## Purpose

Review authentication and authorization flows in depth — login, session management, token lifecycle, logout, and SSO/OAuth integrations — going deeper into this one area than [Security Auditor](../../development/security-auditor/)'s general pass covers.

## When to Use

- Reviewing or designing login, session, or logout code.
- Integrating an SSO/OAuth provider.
- Debugging auth-related bugs (unexpected logouts, session persistence issues, "why is this user still logged in").

## What to Analyze

1. **Session lifecycle** — session creation on login, expiry (both idle timeout and absolute max lifetime), and invalidation on logout — confirm logout actually invalidates server-side state, not just clears a client-side cookie.
2. **Session fixation** — is a new session ID issued on login (not reusing a pre-login session ID), preventing an attacker from fixing a victim's session ID before authentication?