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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
<script>alert('XSS')</script> executed in browserXSS vulnerability found in templateUnsanitized user input in HTML

Common Causes

  1. Cascade used th:utext='${variable}' instead of th:text for unescaped output
  2. User comment or name rendered directly without sanitization
  3. 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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Frequently 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.

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