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Security audit

Microsoft OneNote

Security checks for vulnerabilities and agentic risk

Overview

This OneNote skill is a disclosed Maton integration that uses managed OAuth and includes broad but clearly labeled platform automation reference material.

Install only if you are comfortable authorizing OneNote through Maton. Review any function, trigger, or destination before approving it, because those can run persistently or forward event data; for ordinary OneNote work, prefer read/list calls and confirm every write.

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
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
  • MCP Tool PoisoningHidden Instructions, Unicode Deception, Parameter Description Injection
  • 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)

Description-Behavior Mismatch

Medium
Category
Not specified by scanner
Confidence
97% confidence
Finding

The OneNote skill manifest says the trigger reference files under references/<source>/triggers.md are shared platform catalogues and do not add OneNote capability, but this file still documents GitHub event payloads, scoping, and destination behavior in detail. That creates a manifest-to-file mismatch because the shipped skill content includes operational guidance for GitHub-triggered automations even though the skill is presented as an OneNote API integration.

Content

No source excerpt is available for this finding.

Context-Inappropriate Capability

Medium
Category
Not specified by scanner
Confidence
95% confidence
Finding

The skill's stated purpose is managing OneNote notebooks, sections, and pages through Microsoft Graph. This file instead provides detailed schemas and handling instructions for GitHub webhook-style events, including pull requests, issues, pushes, and releases, which are not justified by the OneNote integration purpose.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.