DadgogoAI Dictionary

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agent hijacking

noun \ˈā-jənt ˈhī-ˌja-kiŋ\

also AI agent hijacking

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Definition of agent hijacking

  1. : an attack that redirects an AI agent's goals, reasoning, or tool actions toward an attacker's objective while the agent retains its legitimate access and permissions

    • The security team treated the malicious document as an agent-hijacking attempt because it tried to redirect the assistant's browser actions.
    • Limiting an agent's permissions can reduce the damage if prompt injection leads to agent hijacking.

Origin & history

first known use2025

The term gained wider use in AI-agent security guidance during 2025 and 2026 to describe attackers taking over an agent's runtime behavior through methods such as indirect prompt injection, poisoned tools, or manipulated memory.

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Cite this entry

"Agent hijacking." AI Dictionary, Dadgogo, https://dadgogo.com/dictionary/agent-hijacking/. Accessed 5 Oct. 2026.

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