Audit JavaScript for DOM XSS tainted data flow from sources to sinks.
npx skills add https://github.com/securityfortech/hacking-skills --skill dom-xss
Please help me install this Agent Skill. Skill: dom-xss Source: https://github.com/securityfortech/hacking-skills/tree/main/skills/web/client-side/dom-xss Command: npx skills add https://github.com/securityfortech/hacking-skills --skill dom-xss
This Skill addresses DOM-based Cross-Site Scripting (XSS), a vulnerability where client-side JavaScript mishandles attacker-controlled data, leading to arbitrary code execution without server interaction.
location.hash, document.referrer) and writes to dangerous sinks (e.g., innerHTML, eval).textContent instead of innerHTML, sanitizing input with DOMPurify, and implementing Content Security Policy (CSP).Audit the provided JavaScript code for DOM-based XSS vulnerabilities by checking for tainted data flow from DOM sources to dangerous sinks.
High-intent search queries and answers about installing and using this skill.
Detect DOM-based XSS by auditing JavaScript for tainted data flow from controllable DOM sources like location.hash to dangerous sinks like innerHTML. You can perform this analysis through manual review using browser DevTools or automated scanning.
Common DOM XSS sources include location.hash, document.referrer, and URL parameters, while dangerous sinks include innerHTML, eval, and event handlers. Analyzing data flow between these sources and sinks identifies client-side execution risks.
Prevent DOM XSS when dynamically generating content by using safe alternatives like textContent instead of innerHTML, sanitizing inputs with DOMPurify, and implementing a strict Content Security Policy (CSP) to block unauthorized script execution.
Yes, you can use Burp Suite DOM Invader for automated analysis of client-side routing and dynamic content generation. It helps identify tainted data paths from DOM sources to execution sinks without requiring manual DevTools inspection.
DOM-based XSS executes without server interaction because the vulnerability resides entirely in client-side JavaScript. The browser's DOM is modified directly using attacker-controlled data from sources like document.referrer, bypassing server-side validation.
Manual DevTools review is limited by the complexity of client-side routing and dynamic event handlers. It requires tracing tainted data flow through extensive JavaScript, making automated tools like Burp Suite DOM Invader necessary for comprehensive vulnerability detection.
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