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Security audit

Norman: Tax Deduction Finder

Security checks for vulnerabilities and agentic risk

Overview

This skill is a disclosed tax-deduction review workflow that reads business finance data and only recategorizes transactions after user confirmation.

Install this only if you use Norman Finance for German business tax review, and confirm the period, jurisdiction, and any proposed transaction recategorization before allowing changes.

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
88% confidence
Finding
The skill description uses very broad trigger phrases such as saving taxes, deductible expenses, and write-offs, which can cause the skill to be invoked in many ordinary finance conversations without clear scoping. That increases the chance of unsolicited access to sensitive financial data and inappropriate tax guidance being applied when the user did not explicitly ask for transaction-level deduction analysis.

Natural-Language Policy Violations

Medium
Confidence
91% confidence
Finding
The skill hard-codes German tax concepts, rules, and SKR04 categorization throughout its operational steps without requiring confirmation that the user is subject to German tax law. If invoked for a user in another jurisdiction, it could generate incorrect tax treatment, miscategorize records, and prompt harmful financial actions based on the wrong legal regime.

Static analysis

No suspicious patterns detected.