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Security audit

zoho-calendar

Security checks for vulnerabilities and agentic risk

Overview

This Zoho Calendar skill is broad and includes automation reference material, but its sensitive behaviors are disclosed, scoped, and tied to user approval.

Before installing, understand that this skill can manage and delete Zoho Calendar data through your Maton-connected account and can set up persistent functions or triggers if you approve them. Use read-only actions first, confirm every write/delete/automation, keep trigger destinations on Maton-controlled hosts unless you explicitly trust another host, and do not expose Maton API keys or OAuth credentials.

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
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)

Context-Inappropriate Capability

Medium
Category
Not specified by scanner
Confidence
95% confidence
Finding

The manifest states this is a Zoho Calendar integration for managing calendars and events, and explicitly says Zoho Calendar is not an event source. This file documents Gmail-triggered email event handling, including forwarding private correspondence, which is a separate capability not justified by the skill's stated calendar-management purpose.

Content

No source excerpt is available for this finding.

Description-Behavior Mismatch

Medium
Category
Not specified by scanner
Confidence
94% confidence
Finding

The skill manifest says this skill is for Zoho Calendar calendar/event management and explicitly states Zoho Calendar is not an event source, while this file documents Linear event types, payloads, and trigger scoping. Although the file notes it is shared platform reference text, it still embeds actionable Linear trigger capabilities in the skill package, which does not match the skill's stated Zoho Calendar behavior.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.