Made by HK
Note: Because Joomla core 3.9.21 fixed improperly, therefore this bug has't patched improperly. I can bypass this patch eseaily. I want to keep this secret until this bug will have been fixed completely.
Link
https://developer.joomla.org/security-centre/827-20200803-core-directory-traversal-in-com-media.html
PoC (Full)
Affected version: Joomla core <=3.9.24
User requirement: Admin account (Not Superadmin)
Gain access: Create superadmin, then trigger RCE.
Remote Code Execution (RCE) in Joomla
Run cve202024597.py with your credentials and access link rce:
#python cve202024597.py -url http://test.local -u admin -p 1234 -rce 1

Full PoC in here:
https://github.com/HoangKien1020/CVE-2021-23132