Xero

• Outcome: Review
• Latest audit: Nov 3, 2026 · 11:31 AM UTC
• Version: 1.0.5

Overview

The skill requires approval for Xero changes, but its setup runs unchecked downloads and can introduce broader changes to installed agent skills.

Review and install a fixed CLI release yourself before using this skill. Consider disabling automatic skill synchronization, connect only the intended Xero account, and retain confirmation for every accounting change. OOMOL mediates the integration. The remote installer could not be inspected, so its complete local effects remain uncertain.

A.I.G

Vulnerability Patterns

• Skill Instruction Hijacking: Alters the agent's session goals or safety constraints when the skill loads
• Agent Memory Poisoning: Writes attacker-controlled rules into memory that affect later sessions
• Remote Payload Retrieval and Execution: Fetches external code whose behavior can change after review
• Embedded Malicious Code: Ships malicious scripts inside the skill and executes them locally
• Unauthorized Access and Privilege Escalation: Obtains permissions beyond the task's legitimate needs

SkillSpector

Vulnerability Patterns

• Supply Chain: Unpinned Dependencies, External Script Fetching, Obfuscated Code
• Excessive Agency: Unrestricted Tool Access, Autonomous Decision Making, Scope Creep
• MCP Tool Poisoning: Hidden Instructions, Unicode Deception, Parameter Description Injection
• Prompt Injection: Instruction Override, Hidden Instructions, Exfiltration Commands
• Data Exfiltration: External Transmission, Env Variable Harvesting, File System Enumeration

Findings (3)

Description-Behavior Mismatch

High

• Category: MCP Tool Poisoning
• Confidence: 96% confidence

Finding

The declared purpose concerns Xero data operations, while the supplied code executes an external CLI installer without establishing any connection to Xero functionality. This is not demonstrated to be a supporting implementation detail. The downloaded script's contents are unavailable, so its further behavior cannot be determined.

Content

No source excerpt is available for this finding.

External Script Fetching

High

• Category: Supply Chain
• Confidence: 98% confidence

Finding

The setup instructions pipe a mutable remote script directly into Bash without verifying a pinned version, signature, or trusted digest; the PowerShell alternative uses the same download-and-execute pattern. If the installer endpoint or its delivery infrastructure is compromised, attacker-controlled code could execute with the agent process's permissions and access local files or credentials. Conditional execution only when the CLI is missing reduces exposure, but neither HTTPS nor server-side Xero token handling prevents this local code-execution risk.

Content

Scanner excerpt · SKILL.md (reported line 69)May include surrounding context.

• oo: command not found — install the oo CLI (other platforms: https://cli.oomol.com/install-guide.md):

  bash

  curl -fsSL https://cli.oomol.com/install.sh | bash    # macOS / Linux
  

  powershell

Autonomous Decision Making

Medium

• Category: Excessive Agency
• Confidence: 80% confidence

Finding

Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.

Content

Scanner excerpt · SKILL.md (reported line 90)May include surrounding context.

md

- **`OOMOL_INSUFFICIENT_CREDIT`** — OOMOL billing stop. Recharge at `https://console.oomol.com/billing/token-recharge` before retrying.

- **HTTP 402 without `OOMOL_INSUFFICIENT_CREDIT`** — the third-party account itself has no active plan or credit. Report the provider error message as is; do not ask the user to recharge OOMOL.

## Resources