AI agents use pfsense_create_services_haproxy_settings_email_mailer to create or update resources in Pfsense — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Pfsense environment.
The tool appears to create or modify HAProxy email mailer settings based on its name structure. This is a Write operation (creates/modifies configuration reversibly) rather than Read, Execute, or Destructive. Severity is medium because misconfigured email settings could disrupt critical alert notifications from the firewall, but does not directly compromise network security or permit code execution.
From the tool's definition Tool name contains 'create' and 'settings' indicating modification of HAProxy email mailer configuration in pfSense. Description is empty, limiting precision.
Attacks that exploit this kind of access
pfsense_create_services_haproxy_settings_email_mailer. It is categorised as a Write tool in the Pfsense MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Pfsense MCP server in PolicyLayer and add a rule for pfsense_create_services_haproxy_settings_email_mailer: 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 Pfsense. Nothing to install.
pfsense_create_services_haproxy_settings_email_mailer is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the pfsense_create_services_haproxy_settings_email_mailer 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 pfsense_create_services_haproxy_settings_email_mailer. 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.
pfsense_create_services_haproxy_settings_email_mailer is provided by the Pfsense MCP server (abl030/pfsense-mcp). 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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