# Hunt Auth Bypass

Hunting skill for auth bypass vulnerabilities.

- Repository: https://github.com/elementalsouls/Claude-BugHunter (5368 stars)
- Category: Design
- License: MIT
- Last updated: 2026-11-01
- Runs scripts: no, instructions only

## Install

Claude Code: `npx skills add elementalsouls/Claude-BugHunter --skill hunt-auth-bypass -g -a claude-code -y`
Codex: `npx skills add elementalsouls/Claude-BugHunter --skill hunt-auth-bypass -g -a codex -y`
Cursor: `npx skills add elementalsouls/Claude-BugHunter --skill hunt-auth-bypass -g -a cursor -y`
Gemini CLI: `npx skills add elementalsouls/Claude-BugHunter --skill hunt-auth-bypass -g -a gemini-cli -y`
Claude Code plugin marketplace: `/plugin marketplace add elementalsouls/Claude-BugHunter`

## Description

Hunting skill for auth bypass vulnerabilities. Built from 12 public bug bounty reports across SAML XSW / parser-differential (GitHub Enterprise CVE-2025-25291/25292), SAML signature stripping (Uber, Rocket.Chat, samlify CVE-2025-47949), SAML domain enforcement bypass via control characters (HackerOne 2024), partner-portal cross-IdP assertion reuse (Slack), WordPress XMLRPC bypassing SSO (Uber), JWT alg-confusion HS256/RS256 (Jitsi), JWT signature-validation skip (Linktree, Newspack), and token-audience confusion (Argo CD CVE-2023-22482). For standalone JWT signature/crypto forging (alg:none, key confusion, kid/jku) see hunt-jwt-crypto; this skill covers JWT only inside SSO/SAML/token-trust bypass chains. SAML assertion-layer attacks (XSW, comment injection, signature stripping, XXE-in-assertion) are owned by hunt-saml; this skill owns the broader cross-protocol auth-bypass taxonomy. Use when hunting auth bypass, see the Legacy-Protocol Matrix for branded-UI vs legacy-endpoint patterns.

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

## Crown Jewel Targets

Auth bypass is consistently one of the highest-paying vulnerability classes in bug bounty because it directly violates the most fundamental security control. High-value targets include:

- **SSO/SAML implementations** at enterprise SaaS companies (Slack, Okta, OneLogin integrations), payouts regularly in the $5K, $25K+ range
- **Admin panels and partner/internal portals**, subdomain-separated admin surfaces like `partners.shopify.com`, `admin.company.com`
- **Third-party auth plugin integrations**, WordPress plugins (OneLogin, WP-SAML-Auth), Drupal SSO modules, any CMS with pluggable auth
- **XMLRPC endpoints** on WordPress, often forgotten, bypasses standard WP auth flows entirely
- **OAuth callback flows**, state parameter mishandling, redirect_uri mismatches
- **API authentication layers**, especially where auth was bolted on after the fact

**Asset priority:** Targets with federated identity (SAML, OAuth, OIDC) connected to large user populations. Partner/reseller portals are particularly juicy because they often have elevated permissions and less security scrutiny than the main product.

---

### SSH certificate-authority trust forgery (Git-hosting / enterprise platforms)
When an org or instance registers an SSH certificate authority, cert `principals` may not be bound server-side to the requesting identity, a member can mint a cert asserting another user's principal and authenticate as them (e.g. modify another user's resource given only its URL). Add SSH-CA trust to the auth-surface list on Git-hosting targets; niche/platform-specific. Disclosed: reports/1901040.

## Attack Surface Signals

**URL patterns to hunt:**
```
/xmlrpc.php
/wp-login.php
/saml/
/sso/
/auth/saml/callback
/oauth/callback
/partners.*
/admin.*
/?wc-api=
/api/v*/auth
/login?redirect=
/accounts/login
```

The rest: https://github.com/elementalsouls/Claude-BugHunter/blob/HEAD/skills/hunt-auth-bypass/SKILL.md