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Security audit

Qqmail 1.0.0

Security checks for vulnerabilities and agentic risk

Overview

This QQ Mail skill does what it says: it reads, searches, and sends mail through QQ Mail using user-provided credentials, with no hidden persistence or unrelated behavior found.

Install only if you intend to let the agent access your QQ mailbox with QQMAIL_USER and QQMAIL_AUTH_CODE. Review any send command, recipient, message body, and attachment path before allowing execution, because attachments and email contents will leave your environment via QQ Mail.

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
  • MCP Least PrivilegeUnderdeclared Capability, Wildcard Permission, Missing Permission Declaration
  • 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)

Lp3

Medium
Category
MCP Least Privilege
Confidence
93% confidence
Finding
The skill explicitly relies on environment variables for credentials and on outbound IMAP/SMTP network access, but it does not declare an explicit tool scope or permissions boundary. That omission can cause the agent framework or reviewer to underestimate the skill's ability to access secrets and transmit data externally, increasing the chance of overbroad or unintended use.

Missing User Warnings

Medium
Confidence
94% confidence
Finding
The send-email and attachment features transmit user-provided content and files to external mail servers and recipients, but the skill text does not clearly warn about that data egress. In an agent setting, missing disclosure raises the risk that sensitive content, attachments, or personal data are sent externally without sufficiently explicit user awareness or confirmation.

Static analysis

No suspicious patterns detected.