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832 AI researchers trick chatbots into sharing how to make cocaine as long as they believe a user is wearing a green shirt — 'CoT Forgery' exploit spurs LLMs to divulge forbidden info by faking trusted chains of thought

Tom's Hardware
Tom's Hardware · 07/01/2026 06:00 EDT

AI researchers trick chatbots into sharing how to make cocaine as long as they believe a user is wearing a green shirt — 'CoT Forgery' exploit spurs LLMs to divulge forbidden info by faking trusted chains of thought

Tagged partitions of a LLM's input sequence are meant to provide security through trusted roles, but it turns out that models judge whether inputs sound like they belong in certain tags rather than literally interpreting them, making them vulnerable to prompt injection.

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