Description

Stored cross-site scripting (also known as second-order or persistent XSS) arises when an application receives data from an untrusted source and includes that data within its later HTTP responses in an unsafe way.

Proof of Concept

Payload:  [ "&gt;<img src>] ****

1) Go to https://demo.usememos.com/ and login into your account 
2) Add a memo with the payload mentioned above ( [ "&gt;<img src>] ****)
3) You will see that an XSS popup will trigger 
4) Each time you visit this page you will see a pop-up

POC video: https://drive.google.com/file/d/1Tg03gDlcxpywoCTXTHKSuSH8xdsPUb5_/view?usp=sharing