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Security audit

Mermail Support Agent

Security checks for vulnerabilities and agentic risk

Overview

This skill is a clearly scoped Mermail support-inbox helper with disclosed email access and strong approval safeguards for sending, forwarding, moving, or deleting mail.

Install this only for a Mermail support mailbox you intend the agent to help manage. Review recipient and message previews before approving sends or forwards, and keep destructive deletion approvals rare and explicit.

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
  • 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
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
Findings (1)

Vague Triggers

Medium
Category
Not specified by scanner
Confidence
92% confidence
Finding

The activation prompt is broad enough that ordinary support-related requests could invoke this skill without strong scoping or user confirmation. Because the skill is wired to a live Mermail mailbox MCP server, over-broad activation can lead to unintended access to customer email, drafting/sending replies, or mailbox state changes in contexts where a narrower tool should have been used.

Content

No source excerpt is available for this finding.