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Security audit

Invoice Ninja

Security checks for vulnerabilities and agentic risk

Overview

This skill coherently connects an agent to Invoice Ninja through OOMOL, with disclosed account reads and confirmed write/destructive actions, but its CLI install fallback deserves caution.

Install only if you intend to let OOMOL operate your connected Invoice Ninja account. Review write/destructive payloads carefully before approval, and install the `oo` CLI from verified official instructions rather than blindly running a piped installer command.

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
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
  • 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
Findings (2)

External Script Fetching

High
Category
Supply Chain
Confidence
97% confidence
Finding

The skill instructs use of a network-fetched install script piped directly into a shell (curl ... | bash), which is a classic supply-chain and remote code execution risk. If the remote host, transport path, or script content is compromised, arbitrary code will execute immediately on the user's machine without review; in a skill context, this is especially dangerous because it may normalize unsafe execution patterns during failure handling.

Content

Scanner excerpt · SKILL.md (reported line 65)May include surrounding context.

Vague Triggers

Medium
Category
Not specified by scanner
Confidence
95% confidence
Finding

The trigger phrase 'Use this skill for ANY Invoice Ninja request' is overly broad and lacks clear activation boundaries, which can cause the agent to invoke the skill for casual mentions, low-risk informational queries, or situations where a safer/native path would be more appropriate. Because this skill includes write and destructive actions, over-activation increases the chance of unintended state-changing operations or unnecessary exposure to external tooling.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.