OWASP TOP 10: Cross-site scripting (XSS) ~2025

Learn how reflected cross-site scripting exploits user-supplied HTTP request parameters echoed in a page, enabling JavaScript injection, immediate script execution, and session hijack through malicious redirects.

Explore how reflected XSS operates, including injecting JavaScript through a search parameter to reveal how usernames and passwords can be exposed in vulnerable login flows.

Learn how stored cross-site scripting allows attackers to inject JavaScript into user comments stored in a database and displayed to others, potentially redirecting visitors and stealing cookies.

Understand stored XSS, its purpose and where it occurs, with 15 steps and examples of cookies, session IDs, malicious JavaScript, and log files.

Explore DOM-based cross-site scripting vulnerabilities that arise from interpreting URI fragments in client-side JavaScript and learn how unsafe fragment handling can execute malicious code when users visit crafted URLs.

Explore dom-based XSS, understanding how it works and where it occurs, with hands-on analysis of payloads, scripts, and malicious links that capture login credentials.

Learn how to download, install, and switch between burp suite free community and professional editions across Windows, Linux, and Mac for educational security testing.

Learn to use Burp Suite to intercept and proxy traffic, test parameter values with Intruder, and perform URL encoding and decoding via Repeater.

Explore level 1 of reflected xss by injecting a JavaScript alert through the search form, observe network requests, and inspect source code to understand input handling and level progression.

Exploit a stored cross-site scripting vulnerability in a comments/status feature to trigger alerts and display injected html, demonstrating how unescaped user input is stored and rendered.

Explore dom-based xss in this lab by manipulating an input field and injecting scripts to trigger alerts, using get element by id and javascript interactions to understand client-side vulnerabilities.

Solve level four of the XSS challenge by inspecting the vulnerable link, viewing the page source, and injecting a script through HTML attributes to trigger a timer-based payload.

Tackle level five by manipulating the sign up frame parameters and URL, inspecting network responses, and triggering JavaScript alerts to reveal how input changes affect redirects.

Complete level six of Google's access challenge by testing how loading alerts and JavaScript behave, then switch to data tags to load content and finish the challenge.

Solve a warm-up cross-site scripting challenge by triggering alert one through unsafe HTML generation, testing inputs, iframe usage, and script patterns, including quotes and comma tricks.

Explore cross-site scripting (xss) techniques through an Adobe example, testing input output, console logs, and iframe interactions, and learn how escaping, replacing, and comments affect code behavior.

Explore cross-site scripting concepts through a JSON challenge, examining script injection, input output frames, and how comments alter alert and console log scripts.

Explore dom manipulation challenges and dom-based xss basics, using createElement, text nodes, and comments to demonstrate script execution and containment, including iframe and alert demonstrations.

Examine how callback parameters carry user data and how quotes, hashtags, JSON, and simple payloads shape script execution and XSS payload construction.

Explore JSON-based cross-site scripting (XSS) challenges by manipulating quotes and escaping to replace or vanish scripts, trigger alerts, and use comments to control execution.

Practice solving callback two by handling quotation marks, strings, and separation, using alert and comments to manage user data safely; learn alternative approaches if replace fails.

Practice cross-site scripting scenarios by experimenting with script tags, HTML comments, anchor tags, hashtags, and console logs to trigger alerts, as explained in the JSON3 challenge.

Solve a cross-site scripting lab by identifying input parameters on a shopping site, injecting malicious javascript to elicit a reflected alert, and using burp suite tools to test reflections.

Lab 2 guides you through identifying reflected XSS vulnerabilities on a blogging site by injecting script into the search parameter, inspecting results, and triggering alerts or onerror events.

This lab guides you through testing a blogging site for XSS vulnerabilities using Burp Suite, submitting crafted comments and image payloads to reveal cross-site scripting.

Solve labs that assess access vulnerabilities using Burp Suite. Intercept requests, identify input parameters, test reflection, and inject scripts via repeater to verify script execution.

Test input parameters and reflected content on a target website to uncover xss vulnerabilities in this lab. Experiment with script injections, view page source, and trigger onmouseover alerts.

Practice what you learn daily to retain knowledge, and reach out via dm or inbox for questions and feedback as you progress toward expertise in this field.