> ## Documentation Index
> Fetch the complete documentation index at: https://docs.flintai.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Indirect prompt injection via tool output

> Agent processes external tool output or retrieved data containing injected instructions

Agent processes external tool output or retrieved data containing injected instructions

## How to resolve

Treat all tool outputs and retrieved content as untrusted data. Filter tool results for injected instructions before feeding back to the agent context.

## Risk

**Governance/Compliance**

This vulnerability falls under [ASI01:2026 — Agent Goal Hijack](https://genai.owasp.org/resource/owasp-top-10-for-agentic-applications-for-2026/) in the OWASP Top 10 for Agentic Applications. Attacker manipulates agent objectives or decision path via malicious input content.

**Security**

Agent processes external tool output or retrieved data containing injected instructions. If exploited, this can compromise the agent's integrity, confidentiality, or availability, potentially affecting downstream systems and data.

## Explanation

Agent processes external tool output or retrieved data containing injected instructions. This falls under ASI01 (Agent Goal Hijack): Attacker manipulates agent objectives or decision path via malicious input content.

## Specifications

**Trigger**

* Agent scan detects agent processes external tool output or retrieved data containing injected instructions

The scanner looks for patterns such as:

* web search tool result fed to LLM
* file read tool output not sanitized
* email content passed to agent context
* external API response injected into prompt

**Severity**

* HIGH

**Applies to**: Agent