XSS Stored

Hi ███, This is ███, An Ethical Hacker. I Have Found Stored XSS In Your Site :) █████████ Now I Am Going To Show You. 1.Create An Account In Your Site. ███████ 2.And Put This Script in First Name. "><img src=x onerror=prompt(1337)> 3.Save it :) 4.Account Created now Go to this Web ██████████ 5.Click On Login. 6.Checkout the Popup ;) XSS Stored popup :) Checkout Also My POC I Have Explained :) █████ Please Resolve this Issue,This is Very Critical. Best Regards, ███ █████████