BypassFuzzer - Fuzz 401/403/404 Pages For Bypasses

The original :)

Fuzz 401/403ing endpoints for bypasses

This tool performs various checks via headers, path normalization, verbs, etc. to attempt to bypass ACL's or URL validation.

It will output the response codes and length for each request, in a nicely organized, color coded way so things are reaable.

I implemented a "Smart Filter" that lets you mute responses that look the same after a certain number of times.

You can now feed it raw HTTP requests that you save to a file from Burp.

Follow me on twitter! @intrudir


usage: -h

Specifying a request to test

Best method: Feed it a raw HTTP request from Burp!

Simply paste the request into a file and run the script!
- It will parse and use cookies & headers from the request. - Easiest way to authenticate for your requests

python3 -r request.txt

Using other flags

Specify a URL

python3 -u

Specify cookies to use in requests:
some examples:

--cookies "cookie1=blah"
-c "cookie1=blah; cookie2=blah"

Specify a method/verb and body data to send -u -m POST -d "param1=blah&param2=blah2" -u -m PUT -d "param1=blah&param2=blah2"

Specify custom headers to use with every request Maybe you need to add some kind of auth header like Authorization: bearer <token>

Specify -H "header: value" for each additional header you'd like to add: -u -H "Some-Header: blah" -H "Authorization: Bearer 1234567"

Smart filter feature!

Based on response code and length. If it sees a response 8 times or more it will automatically mute it.

Repeats are changeable in the code until I add an option to specify it in flag

NOTE: Can't be used simultaneously with -hc or -hl (yet)

# toggle smart filter on -u --smart

Specify a proxy to use

Useful if you wanna proxy through Burp -u --proxy

Skip sending header payloads or url payloads

# skip sending headers payloads -u -sh -u --skip-headers

# Skip sending path normailization payloads -u -su -u --skip-urls

Hide response code/length

Provide comma delimited lists without spaces. Examples:

# Hide response codes -u -hc 403,404,400

# Hide response lengths of 638 -u -hl 638


  • [x] Automatically check other methods/verbs for bypass
  • [x] absolute domain attack
  • [ ] Add HTTP/2 support
  • [ ] Looking for ideas. Ping me on twitter! @intrudir

BypassFuzzer - Fuzz 401/403/404 Pages For Bypasses BypassFuzzer - Fuzz 401/403/404 Pages For Bypasses Reviewed by Zion3R on 8:30 AM Rating: 5