Looking for logging into the Xss Bypass site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Xss Bypass site. After that you can login as usual with your login credentials.
https://www.owasp.org/index.php/XSS_Filter_Evasion_Cheat_Sheet
http://www.securityidiots.com/Web-Pentest/SQL-Injection/bypass-login-using-sql-injection.html
https://medium.com/bugbountywriteup/how-i-was-able-to-bypass-strong-xss-protection-in-well-known-website-imgur-com-8a247c527975
https://www.exploit-db.com/exploits/13944
https://github.com/swisskyrepo/PayloadsAllTheThings/tree/master/XSS%20injection