Search for Plex user access across all configured servers using fuzzy matching.
AI agents call plex_lookup_user to retrieve information from Plex MCP Account Finder without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
While this is nominally a Read operation (retrieves user data without side effects), the medium severity reflects that fuzzy user lookup across multiple accounts could facilitate account enumeration, unauthorized access attempts, or privacy violations if misused by an AI agent. The context that this server also generates authentication tokens suggests this tool may be part of a credential acquisition workflow.
From the tool's definition Tool performs 'fuzzy searches for users across servers by email, username, or display name' and 'Search for Plex user access across all configured servers'. These are query operations with no modification or deletion.
Attacks that exploit this kind of access
Search for Plex user access across all configured servers using fuzzy matching. It is categorised as a Read tool in the Plex MCP Account Finder MCP Server, which means it retrieves data without modifying state.
Register the Plex MCP Account Finder MCP server in PolicyLayer and add a rule for plex_lookup_user: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Plex MCP Account Finder. Nothing to install.
plex_lookup_user is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the plex_lookup_user rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for plex_lookup_user. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
plex_lookup_user is provided by the Plex MCP Account Finder MCP server (keithah/plex-mcp-account-finder). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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