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This post covers the first three vulnerabilities in the OWASP Top 10 for LLMs—Prompt Injection (direct and indirect), Insecure Output Handling, and Training Data Poisoning—with fictional but realistic attack scenarios, a real CVE (CVE-2023-29374, LangChain RCE scoring 9.8), and hands-on challenge links from PortSwigger and Lakera's Gandalf game. You'll walk away with a practical understanding of why LLM outputs must be treated as untrusted input and how each vulnerability can chain into real-world impact.
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