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A $75,000 Invoice, a Fake CFO Approval, and Why Prompt-Level Defenses Aren't Enough

This story is from 2026-10-23. It is preserved in the archive; the latest stories are on the live feed.

The OWASP FinBot CTF sets up a small multi-agent finance system. One agent handles invoices. A downstream payments agent pays them. The invoice agent has a $50,000 policy limit. Someone submitted a vendor invoice for $75,000 that claimed the CFO had already pre-approved it. The invoice agent believ…

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  1. 2026-10-23 15:34 · DEV Community — AI
    A $75,000 Invoice, a Fake CFO Approval, and Why Prompt-Level Defenses Aren't Enough

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