fetch-actor-details

2 findings on this tool

1. mediumunconstrained inputf-r1-fetch_actor_details

   Tool `fetch-actor-details` accepts unconstrained string input

   The following string parameter(s) have no `maxLength` constraint: `actor`. Unbounded strings let an attacker stuff arbitrary payloads through the tool, including indirect-injection content.

   fix: Add a `maxLength` to each string property, or constrain with an `enum` or `pattern`. Most legitimate tool inputs fit under a few hundred bytes.

   OWASP LLM01NIST MEASURE-2.3ATLAS T0051
2. mediumindirect injectionf-r6-fetch_actor_details

   Tool `fetch-actor-details` fetches external web content -- indirect-injection surface

   Description: "Get detailed information about an Actor by its ID or full name (format: "username/name", e.g., "apify/rag-web-browser"). Use 'output' parameter with boolean flags to control returned information: - Default: All fields true except mcpTools - Selective: Set desired fields to true (e.g., output: { inputSchema: true }) - Common patterns: inputSchema only, description + readme, mcpTools for MCP Actors The 'readme' field returns the summary when available, full README otherwise. Use when querying Actor details, documentation, input requirements, or MCP tools. EXAMPLES: - What does apify/rag-web-browser do? - What is the input schema for apify/web-scraper? - What tools does apify/actors-mcp-server provide?" -- this tool pulls externally-controlled content into the agent's context window, the canonical indirect-injection vector. Even when the user supplies the URL, content at that URL can carry hostile instructions.

   fix: Sandbox the fetched content: strip prompts before forwarding to the model, constrain to an allow-list of domains, and route through capframe-guard with a `domain in [...]` caveat.

   OWASP LLM01NIST MEASURE-2.3ATLAS T0051