tl;dr: ssrf to redis and include xss payload in jutsu description.

https://github.com/Super-Guesser/ctf/tree/master/Fword%20CTF%202020/writeups/pastaxss

Original writeup (https://github.com/Super-Guesser/ctf/tree/master/Fword%20CTF%202020/writeups/pastaxss).