$ cat writeup.md…
$ cat writeup.md…
BlueHens CTF 2026
Task: a Flask chatbot challenge hides the flag in its system prompt behind a simple CAPTCHA gate and basic output guardrails. Solution: automate CAPTCHA solving, force partial prompt disclosure, then request the prompt in ASCII decimal form so the model leaks the protected text through a transformed representation.
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$sign in$ grep --similar