Mainstay

• Outcome: Review
• Latest audit: May 29, 2026 at 9:37 PM UTC
• Version:
  1.0.2

Overview

This appears to be a legitimate Mainstay integration, but it gives agents broad authenticated power to change business records without clear confirmation rules.

Install only if you trust Membrane and the npm CLI package. Use a least-privileged Mainstay account where possible, prefer pre-built Membrane actions, and require explicit confirmation before any create, update, delete, invoice, bulk, or irreversible operation.

SkillSpector

By NVIDIA

Vulnerability Patterns

• Data Exfiltration: External Transmission, Env Variable Harvesting, File System Enumeration
• Prompt Injection: Instruction Override, Hidden Instructions, Exfiltration Commands
• Privilege Escalation: Excessive Permissions, Sudo/Root Execution, Credential Access
• Supply Chain: Unpinned Dependencies, External Script Fetching, Obfuscated Code
• Excessive Agency: Unrestricted Tool Access, Autonomous Decision Making, Scope Creep

Findings (1)

Missing User Warnings

Medium

• Confidence: 90% confidence
• Finding: The skill explicitly documents a generic proxy request capability supporting arbitrary HTTP methods, headers, body data, query params, and path params, but does not warn that this can perform state-changing or destructive operations. In an agent setting, this increases the chance that the model will issue unsafe POST/PUT/PATCH/DELETE requests without adequate confirmation, potentially modifying or deleting Mainstay data.

VirusTotal

63/63 vendors flagged this skill as clean.