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Security audit

Norman: Invoice Overdue Reminders

Security checks for vulnerabilities and agentic risk

Overview

This skill is a straightforward overdue-invoice reminder workflow that uses financial data and client contact tools only for its stated purpose and requires user approval before sending reminders.

Before installing, confirm you trust the norman-finance MCP connection with invoice, client contact, and transaction data. Review each reminder carefully before approving sends, especially where formal dunning notices may have legal or customer-relationship consequences.

A.I.G

Vulnerability Patterns
  • Skill Instruction HijackingAlters the agent's session goals or safety constraints when the skill loads
  • Agent Memory PoisoningWrites attacker-controlled rules into memory that affect later sessions
  • Remote Payload Retrieval and ExecutionFetches external code whose behavior can change after review
  • Embedded Malicious CodeShips malicious scripts inside the skill and executes them locally
  • Unauthorized Access and Privilege EscalationObtains permissions beyond the task's legitimate needs

SkillSpector

Vulnerability Patterns
  • Trigger AbuseOverly Broad Trigger, Shadow Command Trigger, Keyword Baiting Trigger
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
Findings (2)

Vague Triggers

Medium
Confidence
85% confidence
Finding
The invocation guidance includes broad phrases like 'unpaid invoices', 'overdue payments', and especially 'chasing payments' without clearer scope boundaries or negative examples. In a markdown skill description, this can make activation ambiguous for general discussions about receivables rather than explicit intent to send reminders.

Natural-Language Policy Violations

Low
Confidence
78% confidence
Finding
The note 'In Germany, a Mahnung ... has legal implications' introduces a locale-specific policy assumption in the skill instructions. Because the skill does not clearly state that it is limited to German users or offer locale selection, this may apply a country-specific legal framing without explicit justification or opt-in.

Static analysis

No suspicious patterns detected.