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Security audit

Nginx Proxy Manager

Security checks for vulnerabilities and agentic risk

Overview

This skill is a straightforward Nginx Proxy Manager workflow; its credential use and API calls are disclosed and fit the stated purpose.

Install only if you want an agent to help manage Nginx Proxy Manager. Provide credentials through environment variables or a local secret store, verify NPM_BASE_URL points to your own trusted NPM instance, and review production proxy changes before applying them.

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
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
Findings (1)

External Transmission

Medium
Category
Data Exfiltration
Confidence
60% confidence
Finding

Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

Content

Scanner excerpt · SKILL.md (reported line 29)May include surrounding context.

Example token request:

bash
curl -sS -X POST "$NPM_BASE_URL/api/tokens" \
  -H 'Content-Type: application/json; charset=UTF-8' \
  --data "{\"identity\":\"$NPM_IDENTITY\",\"secret\":\"$NPM_SECRET\"}"

Static analysis

No suspicious patterns detected.