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Security audit

NFT Floor Sweep Calculator

Security checks for vulnerabilities and agentic risk

Overview

This skill is a disclosed NFT floor-price cost calculator that queries public market APIs and does not trade, use wallets, collect secrets, or persist anything.

Before installing, understand that collection slugs or NFT ids you query will be sent to Magic Eden or CoinGecko, and the output is only an estimate, not a trade quote or execution tool.

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 (3)

Undeclared Tool Scope

Medium
Category
MCP Least Privilege
Confidence
92% confidence
Finding

The skill clearly instructs execution of a Python script that makes outbound HTTPS requests, but the manifest does not declare any tool scope such as permissions or allowed-tools. That creates a trust and policy gap: an agent or reviewer cannot tell from the skill declaration that network access is required, which can lead to unintended external communication and weaker enforcement of least privilege.

Content

No source excerpt is available for this finding.

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 39)May include surrounding context.

md
def coingecko_floor(nft_id):
    data = http_get(f"https://api.coingecko.com/api/v3/nfts/{nft_id}")
    fp = data.get("floor_price", {})
    native = fp.get("native_currency")
    symbol = data.get("native_currency_symbol", "ETH")

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 · scripts/floor_sweep.py (reported line 76)May include surrounding context.

python
def coingecko_floor(nft_id):
    data = http_get(f"https://api.coingecko.com/api/v3/nfts/{nft_id}")
    fp = data.get("floor_price", {})
    native = fp.get("native_currency")
    symbol = data.get("native_currency_symbol", "ETH")

Static analysis

No suspicious patterns detected.