Interactive cross-site scripting (XSS) cheat sheet for 2026, brought to you by PortSwigger. Actively maintained, and regularly updated with new vectors.

Cross-Site Scripting (XSS) attacks are a type of injection, in which malicious scripts are injected into otherwise benign and trusted websites. XSS attacks occur when an attacker uses a web application …

Dec 15, 2025 · A cross-site scripting (XSS) attack is one in which an attacker is able to get a target site to execute malicious code as though it was part of the website.

Feb 26, 2025 · This XSS cheat sheet provides a comprehensive guide covering concepts, payloads, prevention strategies, and tools to understand and defend against XSS attacks effectively.

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 …

Jul 3, 2025 · Cross-Site Scripting (XSS) represents one of the most prevalent and dangerous vulnerabilities in modern web applications. Understanding XSS is crucial for developers who want to …

Understand XSS vulnerabilities including stored, reflected, and DOM-based types, how attackers exploit them, and how to prevent cross-site scripting attacks.

What Is a Cross-Site Scripting (XSS) Vulnerability? A Cross-Site Scripting (XSS) vulnerability is a security flaw that allows an attacker to inject malicious code into a trusted website.

May 9, 2025 · XSS is a vulnerability that allows an attacker to inject malicious code (usually JavaScript) into web pages. This code gets executed inside the victim’s browser instead of just being displayed...

XSS is a type of web security vulnerability that allows an attacker to inject malicious code into a website viewed by other users. XSS attacks are a serious threat to web security and can have significant …