Bypass 403 and 401 access control errors from WAFs, proxies, and CDNs.
npx skills add https://github.com/dreadnode/capabilities --skill 403-bypass
Please help me install this Agent Skill. Skill: 403-bypass Source: https://github.com/dreadnode/capabilities/tree/main/capabilities/web-security/skills/403-bypass Command: npx skills add https://github.com/dreadnode/capabilities --skill 403-bypass
This Skill solves the problem of being blocked by 403/401 access control errors from WAFs, reverse proxies, or CDNs when attempting to reach legitimate internal or admin endpoints that are restricted at the edge security layer rather than the application layer.
Use the 403-bypass skill to systematically test a blocked /admin endpoint on your authorized target web application to identify potential WAF or proxy access control bypass opportunities.
High-intent search queries and answers about installing and using this skill.
To bypass a 403 error, you apply systematic techniques like path manipulation, header spoofing, HTTP verb tampering, and protocol-level tricks to evade edge access controls. This specifically targets misconfigured WAF or reverse proxy rules restricting the endpoint.
A 403 block from a WAF or reverse proxy occurs at the network edge, whereas an application layer block originates from the backend code. You triage the source by interpreting HTTP response status, size, and timing signals.
HTTP verb tampering bypasses proxy access controls by altering the HTTP method, such as using PUT or TRACE instead of GET, to trick the edge security layer into allowing requests to internal endpoints. It is a core method for 403 bypass.
Yes, you can use path manipulation during authorized red teaming to reach internal endpoints. This technique modifies the URL structure to evade WAF and reverse proxy access control rules enforced at the edge layer.
Header injection works against 401 access control errors on a CDN by spoofing internal routing headers, which tricks the proxy into treating the request as authorized. This exploits misconfigured edge rules that trust client-supplied header data.
You should not attempt a 403 bypass if the restriction is enforced at the application layer rather than the edge layer, or if you lack explicit authorization for penetration testing and red teaming on the target web application.
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