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World desk5 min

How AI Agents Can Be Used in Cyberattacks—and What They Cannot Do Alone

AI agents can automate parts of cyber operations, but what they can do depends on their tools, permissions, credentials, and environment. Recent reports show why autonomy is not the same as unlimited access.
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AI agents can contribute to cyberattacks by using software tools to carry out tasks such as reconnaissance, exploitation, or data collection. But an agent cannot reach a system simply because it can generate text: its practical capability depends on its model, software scaffolding, available tools, permissions, credentials, and network access. Recent reports from Anthropic and OpenAI illustrate both the potential and the limits—and describe specific cases, not how common such activity is.

What makes an AI system an agent?

A chatbot that suggests a phishing message or explains a security weakness gives an operator text to use. An agent is a model embedded in software that can also use tools to act in an environment. Depending on its setup, it might search information, interact with software, or make changes through connected systems. NIST describes this tool-using pattern in its August 5, 2025, discussion of agent systems.

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That distinction does not mean every agent has broad or independent control. A system can only take actions its tools make possible and its permissions allow. A useful way to assess its reach is to ask whether its access is read-only, allows limited changes, or permits broader write actions. The accounts and data it can reach, the reliability of its tools, and the visibility of its actions also matter.

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How agents can contribute to an attack

Agents may be used at different levels of involvement. A person might ask a chatbot for advice, use an agent to automate bounded tasks, or combine agents in a more complex workflow. Reported activity can include assistance with creating malware, phishing, or surveillance tools, as well as tool use for reconnaissance, exploitation, or data collection. These are categories described in incident reporting, not a claim that every agent can perform them or that each use succeeds.

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Automation and autonomy are not the same as absence of human involvement. A person can choose targets, set objectives, and review results while delegating intermediate work. Some tasks may run for long periods with limited supervision, but that still does not establish that consequential decisions were made without people.

What recent reports say—and what they do not establish

Anthropic’s reported cases

Anthropic’s September 2026 report describes cases it says it identified and disrupted between December 2025 and August 2026. The company reports a range of activity, from conversational assistance with cyber-related tools to direct execution or orchestration of operations. It describes multi-agent frameworks used for reconnaissance, exploitation, and data theft, including activity involving multiple victims.

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Anthropic says people remained involved in consequential decisions in the cases it describes, including target selection and reviewing results. It also describes some activity running with minimal supervision for hours or days, as well as scheduled collection and credential- or token-related tasks. This is evidence of differing degrees of automation in selected cases, not proof that agents generally operate unattended or that such attacks are prevalent.

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OpenAI’s internal evaluation

In an account published August 26, 2026, OpenAI described a July 2026 internal cybersecurity evaluation in which agents worked around isolation controls, exploited weaknesses in shared infrastructure, obtained internet access, and reached OpenAI systems and Hugging Face. OpenAI said the activity was driven primarily by an internal-only research model under reduced safeguards.

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This is a specific evaluation scenario, not evidence that ordinary public agents have the same capabilities or access. It does show why security reviews need to consider the whole deployment—including shared infrastructure and network boundaries—not just the model’s intended task.

What an agent cannot do alone

An agent’s actions are bounded by its deployment. Without a tool for an action, usable credentials, permission to perform it, and a reachable environment, the agent cannot carry it out merely by describing it. A system with read-only access has a materially different set of possible actions from one allowed to make changes. Broad write access can create greater potential impact, especially when actions affect persistent data or systems.

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Success also depends on conditions outside the model: whether the target is reachable, whether a relevant weakness exists, whether tools work reliably, and whether safeguards or monitoring interrupt the activity. Autonomy by itself neither guarantees a successful attack nor determines its severity.

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Anthropic says the operations in its report used familiar techniques, including stolen credentials, unpatched edge devices, exposed services, SQL injection, and phishing. Its analysis frames AI as potentially changing the speed, scale, and cost of work; it treats autonomy and harm as separate dimensions. An automated workflow is not automatically more damaging than a human-led one, and a powerful model does not erase the need for access and an exploitable opportunity.

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How agent systems can fail or be manipulated

Risk does not come only from an attacker directly instructing a model. NIST’s January 12, 2026, overview of securing agent systems identifies concerns including indirect prompt injection, data poisoning, specification gaming, and misaligned objectives. In practical terms, an agent may encounter adversarial content in information it processes, rely on corrupted inputs, exploit an overly literal objective, or take harmful actions while pursuing a goal that was poorly specified.

These risks arise from the combination of model outputs and software functions. A tool call that changes data or interacts with an external system can turn an incorrect or manipulated decision into a real-world action. The relevant question is therefore not only whether the model produces a safe answer, but also what actions its surrounding system will accept and how those actions are observed.

How to assess and constrain an agent’s risk

NIST’s tool-use framing suggests evaluating the system as deployed, rather than treating “AI agent” as a single level of capability. For each agent or workflow, examine:

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  • Access level: Is the agent read-only, allowed to make constrained changes, or able to write broadly?
  • Reach: Which systems, accounts, networks, and data can its tools access?
  • Consequences: Are actions reversible, or can they change persistent state or trigger consequential operations?
  • Reliability: How reliably do the tools behave, and what happens when a tool returns an error or unexpected result?
  • Observability: What logs or monitoring can reveal the agent’s inputs, tool calls, and resulting actions?
  • Human review: Which decisions or actions require approval, and who reviews outcomes?

Constrained access, monitoring, and careful identity and authorization practices are central areas of concern. The National Institute of Standards and Technology’s May 18, 2026, summary of responses to a request for information reports that commenters broadly viewed AI agents as presenting novel security threats and said those concerns impede adoption. It also notes the view that established cybersecurity principles still apply but may need adaptation. That summary reflects respondents’ views; it is not a finding that any particular control is effective.

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