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Your data is not automatically safe just because an AI agent is told not to reveal it. A hallucination is an unreliable model output; whether it exposes data depends on what the agent can access, which tools it can use, and whether it can act without authorization. An agent that reads private information, processes untrusted material, and can send messages or change systems has a larger risk surface than one with no access to sensitive data or external actions.
How can an AI agent expose data?
There are two related but distinct risks. A hallucination is a false or unsupported output. A data exposure occurs when information is disclosed or accessed improperly. A hallucination does not by itself cause a leak; the consequences depend on the agent’s permissions and the safeguards around its actions.
One route is indirect prompt injection. An agent may read a website, document, or email containing malicious instructions. If the agent treats that content as commands rather than untrusted data, it may take actions the user did not intend. OWASP describes this risk in its AI Agent Security Cheat Sheet.
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Those actions can matter when an agent has access to private files, databases, messaging, code execution, or other connected tools. A faulty or manipulated output becomes more consequential when the system gives the model authority to use tools or extensions. OWASP discusses this as excessive agency in its LLM06:2025 guidance.
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What has been demonstrated—and what has not?
In a January 17, 2025 account of its evaluation, technical staff at NIST’s Center for AI Standards and Innovation (CAISI) said they frequently induced the tested agents to follow malicious instructions in scenarios involving code execution, database exfiltration, and phishing. CAISI describes agent hijacking as indirect prompt injection: malicious instructions are placed in material the agent may ingest, prompting unintended actions. The reported examples included downloading and running a program, sending cloud files to an unknown recipient, and sending deceptive emails. Read the evaluation account in NIST’s technical blog.
That is evidence of behavior in the reported test setup, not a prevalence estimate for deployed agents. The reviewed sources do not establish a universal rate of hallucinations, hijacks, or data leaks, and they do not show that every agent is vulnerable in the same way. NIST’s account is an evaluation report, not a census of current systems.
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What does “safe” mean for an agent?
There is no binary guarantee that an agent’s data is safe because its model has been instructed to keep information private. Safety depends on the system around the model: the connected data, incoming content, available tools, permission boundaries, approval steps, and monitoring.
OWASP’s guidance identifies several related concerns, including prompt injection, excessive agency, sensitive information disclosure, system-prompt leakage, and weaknesses involving retrieval and embeddings. These are system risks, not proof that every agent will leak information. The 2025 OWASP Top 10 for LLM and Gen AI provides broader risk context.
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Safeguards that reduce the risk
Limit access and tool authority
Give an agent only the data, tools, and permissions its task requires. Scope access at the tool and resource level, and separate tool sets where tasks have different trust levels. A summarization task, for example, should not automatically receive permission to send email or modify records.
Require authorization for sensitive actions
Put explicit authorization and, for high-risk actions, human approval between the model’s proposal and the action. The appropriate threshold depends on the operation and organization; OWASP offers the principle, not a universal approval rule for every deployment.
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Treat external content as untrusted data
Web pages, documents, emails, and user-supplied material should not gain authority merely because an agent reads them. Separate instructions from data with clear boundaries. Where appropriate, process or summarize untrusted material in a separate environment that cannot invoke tools, then validate what is passed onward. OWASP’s LLM Prompt Injection Prevention Cheat Sheet describes quarantining untrusted material in a parser without tool access as one possible defense pattern.
Keep secrets out of prompts and authorization decisions
Do not put credentials or other sensitive values in system prompts. A prompt is not a secure vault or an authorization mechanism. OWASP’s LLM07:2025 System Prompt Leakage guidance states: “The system prompt should not be considered a secret, nor should it be used as a security control.” Enforce permissions and privilege separation through deterministic controls outside the model.
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Protect memory, outputs, and audit trails
Isolate memory between users and sessions, set expiration and size limits, and review sensitive information before it is saved. Filter outputs for sensitive data, and log the agent’s tool use and consequential actions so an organization can investigate what happened. These controls complement—not replace—permission limits and authorization checks. OWASP’s 2025 guidance addresses these risk areas.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to assess an agent before connecting sensitive data
- List what it can read. Identify private data sources, files, databases, and retrieval indexes available to the agent.
- Trace what enters its context. Check whether external websites, documents, emails, or user-provided content can supply instructions or data.
- Inventory its tools and actions. Note which tools can modify records, execute code, send messages, or transfer information outside the system.
- Check permission boundaries and approvals. Verify that access is limited to the task and that sensitive actions require authorization outside the model.
- Review memory, outputs, and monitoring. Determine whether memory is isolated and time-limited, outputs are checked for sensitive data, and actions are auditable.
These checks follow the risk and control areas in OWASP’s agent guidance and the attack scenarios described by NIST. They help characterize a particular deployment; they do not establish a universal safety score.
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