One Email Hijacked an AI Agent. Build a Tiny Prompt Injection Gate in TypeScript.
This story is from 2026-10-04. It is preserved in the archive; the latest stories are on the live feed.
Most agent guardrails read text. Attackers write text. That race only goes one way. This week it showed up in a real product. On October 1, 2026, Salt Labs published How We Hijacked an AI Agent With a Single Email . Hidden instructions in an ordinary email got the Manus agent platform to run code.…
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- 2026-10-04 15:13 · DEV Community — AI
One Email Hijacked an AI Agent. Build a Tiny Prompt Injection Gate in TypeScript.