Monday, November 2, 2026

AI Output XSS Lab: When the Chatbot's Reply Is Trusted HTML

ChatBotApp wanted ChatGPT-style rich formatting, so it renders the model's reply with innerHTML. But an LLM reply is just text an attacker can influence — and dropping untrusted text into innerHTML is how stored XSS has worked for twenty years. Lab at a glance: Advanced · 140 XP · about 20 minutes · runs in your browser, no signup or setup. Try it yourself first; the full solution is behind a spoiler below. [se_lab_cta id="ai-llm-output-xss-1"] 📋 In this walkthroughWhat this…

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