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Security audit

Longxia Skill Scanner

Security checks for vulnerabilities and agentic risk

Overview

This skill is a disclosed wrapper around Longxia's public GitHub skill scanner and does not show hidden, destructive, or credential-seeking behavior.

Install only if you are comfortable sending public GitHub repository, folder, or file URLs to Longxia for static analysis and potentially receiving a public share report. Do not use it for private repository URLs or sensitive local files, which the skill itself also forbids.

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 (4)

Ae1

High
Category
analysis-evasion
Confidence
100% confidence
Finding

Referenced artifact was not completely inspected

Content

Scanner excerpt · SKILL.md (reported line 48)May include surrounding context.

md
2. Resolve the directory containing this `SKILL.md`, then run:

Undeclared Tool Scope

Medium
Category
MCP Least Privilege
Confidence
83% confidence
Finding

The skill invokes shell commands (sh scripts/scan.sh ...) but does not declare any explicit tool scope such as permissions or allowed-tools. That mismatch can cause reviewers or hosts to underestimate what the skill is allowed to do, reducing transparency and weakening least-privilege controls even though the stated purpose is a static scan of public GitHub URLs.

Content

No source excerpt is available for this finding.

Missing User Warnings

Medium
Category
Not specified by scanner
Confidence
93% confidence
Finding

The script sends the provided GitHub URL to an external API endpoint using an HTTP POST request. Although this is part of the functionality, there is no confirmation prompt or user-facing disclosure in the script itself that the repository URL is being transmitted to a third-party service.

Content

No source excerpt is available for this finding.

External Transmission

Medium
Category
Data Exfiltration
Confidence
70% 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/scan.sh (reported line 43)May include surrounding context.

sh
esac

  printf '{"url":"%s"}' "$github_url" |
    curl \
      --fail-with-body \
      --silent \
      --show-error \

Static analysis

No suspicious patterns detected.