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Security audit

Fastmail Suite

Security checks across malware telemetry and agentic risk

Overview

This is a disclosed Fastmail email, contacts, and calendar helper that uses real account credentials but does not show hidden collection, persistence, exfiltration, or automatic writes.

Install only if you want an agent to access your Fastmail data. Prefer read-only Fastmail tokens for normal use, keep FASTMAIL_ENABLE_WRITES unset unless you intentionally want sending or calendar changes, avoid --raw unless needed, and do not point FASTMAIL_BASE_URL or FASTMAIL_CALDAV_BASE_URL at non-Fastmail hosts.

SkillSpector

By NVIDIA
Vulnerability Patterns
  • MCP Least PrivilegeUnderdeclared Capability, Wildcard Permission, Missing Permission Declaration
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
Findings (1)

Lp3

Medium
Category
MCP Least Privilege
Confidence
95% confidence
Finding
The skill clearly requires sensitive environment variables and invokes Python scripts that perform networked access to Fastmail services, yet the manifest does not declare any permissions/capabilities. This creates a transparency and policy-enforcement gap: users or platforms may not realize the skill can access credentials, make external requests, and execute shell/Python commands, which is especially risky for an email/calendar integration handling real account data.

VirusTotal

66/66 vendors flagged this skill as clean.

View on VirusTotal

Static analysis

No suspicious patterns detected.