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XSS Vulnerability in Thymeleaf Templates
XSS attacks are possible through template injection. Attacker-controlled input executes JavaScript on victim's browser.
Improper escaping of user input in templates allows script execution.
Common Causes
- Using th:utext instead of th:text (unescaped)
- Raw HTML from database without sanitization
- User input directly in JavaScript context
- th:onclick, th:onhover with user data
How to Fix It
Always use th:text (escapes HTML). Use th:utext only for trusted content. Never put user input in script blocks or event handlers. Sanitize HTML with OWASP Java HTML Sanitizer. Use CSP (Content Security Policy) header. Test with OWASP ZAP.
Real developers can help you.
Basel Issmail
’m a Senior Full-Stack Developer and Tech Lead with experience designing and building scalable web platforms. I work across the full development lifecycle, from translating business requirements into technical architecture to delivering reliable production systems.
My work focuses on modern web technologies, including TypeScript, Angular, Node.js, and cloud-based architectures. I enjoy solving complex technical problems and helping teams turn product ideas and prototypes into working platforms that can grow and scale.
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Jared Hasson
Full time lead founding dev at a cyber security saas startup, with 10 yoe and a bachelor's in CS. Building & debugging software products is what I've spent my time on for forever
Alvin Voo
I’ve watched the tech landscape evolve over the last decade—from the structured days of Java Server Pages to the current "wild west" of Agentic-driven development. While AI can "vibe" a frontend into existence, I specialize in the architecture that keeps it from collapsing.
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Vlad Temian
15+ years shipping production infrastructure for startups. Former CTO at qed.builders (acquired by The Sandbox).
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Dor Yaloz
SW engineer with 6+ years of experience,
I worked with React/Node/Python
did projects with React+Capacitor.js for ios
Supabase expert
Anthony Akpan
Developer with 8 years of experience building softwares fro startups
Simon A.
I'm a backend developer building APIs, emulators, and interactive game systems. Professionally, I've developed Java/Spring reporting solutions, managed relational and NoSQL databases, and implemented CI/CD workflows.
Bastien Labelle
Full stack dev w/ 20+ years of experience
Victor Denisov
Developer
You don't need to be technical. Just describe what's wrong and a verified developer will handle the rest.
Get HelpFrequently Asked Questions
What's the difference between th:text and th:utext?
th:text escapes HTML (safe), th:utext outputs raw HTML (unsafe for user input)
How do I sanitize user-provided HTML?
Use OWASP Java HTML Sanitizer library with whitelist approach