What Is XSS (Cross-Site Scripting) in a CMS?
BeginnerQuick Answer
TL;DR
Cross-site scripting (XSS) is an attack where malicious JavaScript code is injected into a CMS-powered website, typically through user input fields like comments, forms, or content editors. When other users view the affected page, the malicious script executes in their browser, potentially stealing session cookies, redirecting to phishing sites, or modifying page content. XSS is one of the most common web vulnerabilities and affects CMS platforms that don't properly sanitize user-generated content.
Key Takeaways
- XSS injects malicious JavaScript into web pages through unsanitized user input
- Three types: Stored XSS (persists in database), Reflected XSS (in URL parameters), DOM-based XSS (client-side)
- CMS comment sections, form fields, and WYSIWYG editors are common XSS vectors
- Prevention requires output encoding, Content Security Policy headers, and input sanitization
- Headless CMS platforms reduce XSS risk by separating content storage from rendering