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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.
Real developers can help you.
Mehdi Ben Haddou
- Founder of Chessigma (1M+ users) & many small projects
- ex Founding Engineer @Uplane (YC F25)
- ex Software Engineer @Amazon and @Booking.com
Milan Surelia
Milan Surelia is a Mobile App Developer with 5+ years of experience crafting scalable, cross-platform apps at 7Span and Meticha. At 7Span, he engineers feature-rich Flutter apps with smooth performance and modern UI. As the Co-Founder of Meticha, he builds open-source tools and developer-focused products that solve real-world problems.
Expertise:
💡 Developing cross-platform apps using Flutter, Dart, and Jetpack Compose for Android, iOS, and Web.
🖋️ Sharing insights through technical writing, blogging, and open-source contributions.
🤝 Collaborating closely with designers, PMs, and developers to build seamless mobile experiences.
Notable Achievements:
🎯 Revamped the Vepaar app into Vepaar Store & CRM with a 2x performance boost and smoother UX.
🚀 Launched Compose101 — a Jetpack Compose starter kit to speed up Android development.
🌟 Open source contributions on Github & StackOverflow for Flutter & Dart
🎖️ Worked on improving app performance and user experience with smart solutions.
Milan is always happy to connect, work on new ideas, and explore the latest in technology.
Dor Yaloz
SW engineer with 6+ years of experience,
I worked with React/Node/Python
did projects with React+Capacitor.js for ios
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You don't need to be technical. Just describe what's wrong and a verified developer will handle the rest.
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.