Reflected XSS into HTML context with nothing encoded

Successfully identified and exploited a Reflected Cross-Site Scripting (XSS) vulnerability in an HTML context within a web application lab environment.

The vulnerability occurred because user input was directly reflected in the HTML response without proper sanitization or encoding. By crafting a malicious payload, it was possible to inject and execute JavaScript code in the victim’s browser.

The testing process involved intercepting HTTP requests, analyzing the application response, and delivering a proof-of-concept payload to demonstrate how an attacker could execute arbitrary scripts.

الأدوات المستخدمة

Burp Suite

Browser Developer Tools

ما تم تنفيذه:

Identified user input reflected directly into the HTML response.

Injected a JavaScript payload to trigger a reflected XSS attack.

Verified successful script execution in the browser.

Documented the vulnerability and potential mitigation techniques.

التأثير الأمني

An attacker could exploit this vulnerability to execute malicious scripts in a user's browser, potentially leading to session hijacking, credential theft, or unauthorized actions.