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Security audit

Calendar Sync

Security checks for vulnerabilities and agentic risk

Overview

This calendar-sync skill is purpose-aligned and disclosed, but users should handle calendar credentials and deletions carefully.

Install only if you are comfortable granting calendar access to the providers involved. Store client secrets in a protected environment or secrets manager, review OAuth scopes, and confirm any delete operation against the exact event before allowing it to run.

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
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
Findings (2)

Missing User Warnings

Medium
Category
Not specified by scanner
Confidence
88% confidence
Finding

The skill instructs users to configure client secrets and perform cross-provider calendar synchronization without any warning about secure secret storage, OAuth token handling, or the privacy implications of moving sensitive calendar data between systems. This can lead to credential leakage, overbroad access, or unintended exposure of meeting details, attendees, and reminders if users follow the documentation naively.

Content

No source excerpt is available for this finding.

Missing User Warnings

Medium
Category
Not specified by scanner
Confidence
90% confidence
Finding

The skill documents a destructive delete operation with no mention of confirmation, dry-run behavior, scope checks, or recovery limitations. In an agent setting, this increases the chance of accidental or unauthorized event deletion across synchronized calendars, especially if the command is invoked automatically from ambiguous user intent.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.