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401-403-bypass-techniques

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401/403 bypass playbook. Use when encountering access-denied responses on admin panels, API endpoints, or restricted paths. Covers path manipulation, HTTP method tampering, header injection, protocol downgrade, and automated bypass tools.

skills/401-403-bypass-techniques/SKILL.md

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# SKILL: 401/403 Bypass Techniques — Expert Attack Playbook

> **AI LOAD INSTRUCTION**: Comprehensive 401/403 forbidden bypass techniques. Covers path normalization tricks, HTTP method override, header-based bypasses (X-Original-URL, X-Forwarded-For), protocol version tricks, and combination attacks. Base models typically know 2-3 header bypasses but miss the full matrix of path manipulation variants and verb+path combos.

## 0. RELATED ROUTING

- [authbypass-authentication-flaws](../authbypass-authentication-flaws/SKILL.md) — broader auth bypass (login flaws, session handling)
- [waf-bypass-techniques](../waf-bypass-techniques/SKILL.md) — when bypass is WAF-specific rather than access control
- [http-host-header-attacks](../http-host-header-attacks/SKILL.md) — Host header manipulation for routing bypass
- [request-smuggling](../request-smuggling/SKILL.md) — smuggle past access controls entirely
- [http2-specific-attacks](../http2-specific-attacks/SKILL.md) — h2c smuggling to bypass proxy ACLs

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