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Security audit

Mailgun Simple

Security checks for vulnerabilities and agentic risk

Overview

This skill is a straightforward Mailgun email sender whose API key use and outbound email behavior match its stated purpose.

Install this only if you are comfortable giving the skill access to a Mailgun API key and sending the email recipient, subject, and body to Mailgun. Avoid using it for secrets or regulated data unless your Mailgun account and workflow are approved for that use.

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)

Undeclared Tool Scope

Medium
Category
MCP Least Privilege
Confidence
90% confidence
Finding

The skill exposes capabilities that use sensitive environment variables and external networked functionality, but it does not declare an explicit tool scope such as permissions or allowed-tools. This weakens policy enforcement and reviewability, making it easier for an agent to invoke the skill without clear guardrails around secret use and outbound actions.

Content

No source excerpt is available for this finding.

Missing User Warnings

Low
Category
Not specified by scanner
Confidence
91% confidence
Finding

The skill sends recipient addresses, subject lines, and message bodies to Mailgun, but the description does not explicitly warn users that their provided content will be transmitted to a third-party external service. This can lead to accidental disclosure of sensitive or regulated data because users or calling agents may not realize the privacy boundary.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.