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Cascade Introduced XSS Vulnerability in Templates
Cross-site scripting (XSS) vulnerability introduced in Cascade-generated templates. User input is rendered without HTML escaping, allowing attackers to inject malicious JavaScript that runs in other users' browsers.
This is a critical security issue requiring immediate fix.
Error Messages You Might See
<script>alert('XSS')</script> executed in browser
XSS vulnerability found in template
Unsanitized user input in HTML
Common Causes
- Cascade used th:utext='${variable}' instead of th:text for unescaped output
- User comment or name rendered directly without sanitization
- Cascade removed HTML escaping in frontend template or disabled it
How to Fix It
Use th:text='${variable}' instead of th:utext to enable HTML escaping. Sanitize user input server-side if HTML is needed. Use security libraries like OWASP ESAPI or DOMPurify for sanitization. Never render user input directly without escaping. Review all template variables for proper escaping.
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Get HelpFrequently Asked Questions
How do I prevent XSS in templates?
Always escape user input. Thymeleaf: use th:text not th:utext. Never render user data as HTML.
When should I use utext?
Only if you control the HTML content (static content from database). Never with user-provided input.