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Security audit

Outlook Calendar

Security checks for vulnerabilities and agentic risk

Overview

The skill is mostly coherent for managing Outlook Calendar through OOMOL, but its fallback setup tells agents to run remote installer scripts directly in a shell without verification or explicit user approval.

Review this before installing if you are not comfortable with an agent installing the oo CLI from a remote script. Prefer manually installing oo from OOMOL's official instructions, verifying the source, and requiring confirmation before any calendar write, update, cancel, or delete action.

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
Content
- **`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
Confidence
98% confidence
Finding
The skill instructs the agent to install software by piping a remotely fetched script directly into a shell (`curl ... | bash`). This is dangerous because any compromise of the hosting site, network path, or install script would result in immediate arbitrary code execution on the user's machine, and the skill context makes it worse by presenting the step as an operational fallback for using the connector.

Vague Triggers

Medium
Confidence
97% confidence
Finding
The manifest description says to use this skill for "ANY Outlook Calendar request" and whenever a task involves Outlook Calendar, which is broader than a specific trigger phrase or constrained invocation condition. Because it lacks exclusions or negative examples, it could cause unintended activation for ordinary mentions of Outlook Calendar.

Static analysis

No suspicious patterns detected.