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Security audit

MailerSend

Security checks for vulnerabilities and agentic risk

Overview

The skill is a coherent MailerSend connector, but it needs review because its setup instructions execute a remote installer directly in the user's shell.

Before installing, review the oo CLI source and installation method instead of blindly running the remote installer, and make sure you are comfortable connecting OOMOL to MailerSend. Treat send_email as a real account action and confirm the exact recipient, content, and purpose before allowing it.

A.I.G

Vulnerability Patterns
  • Remote Payload Retrieval and ExecutionFetches external code whose behavior can change after review
  • 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
  • Embedded Malicious CodeShips malicious scripts inside the skill and executes them locally
  • Unauthorized Access and Privilege EscalationObtains permissions beyond the task's legitimate needs
Findings (1)

T03 · Remote Payload Retrieval and Execution

Error
Location
SKILL.md:66
Finding

Unverified Remote Installer Download and Immediate Execution

Content
View full analysis
Remediation
View remediation

SkillSpector

Vulnerability Patterns
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
  • 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
Findings (2)

External Script Fetching

High
Category
Supply Chain
Confidence
97% confidence
Finding

The skill instructs users to install software via a remote script piped directly into bash, which executes unverified code fetched at runtime. If the remote host, network path, or installation script is compromised, this becomes an immediate arbitrary code execution path on the user's machine.

Content

Scanner excerpt · SKILL.md (reported line 66)May include surrounding context.

Vague Triggers

Medium
Category
Not specified by scanner
Confidence
95% confidence
Finding

The description says to use this skill for ANY MailerSend request and instead of calling the API directly, which is an overly broad routing trigger. That can cause the agent to invoke this skill in situations where narrower, safer, or more context-appropriate handling should apply, increasing the chance of unintended email operations or unnecessary exposure to external tooling.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.