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Security audit

Modern URL shortening with QR codes and detailed analytics

Security checks for vulnerabilities and agentic risk

Overview

This skill is a straightforward Jo4 URL shortener and analytics API guide, with expected external API calls and no hidden execution, persistence, or local access.

Install only if you intend to let the agent use your JO4_API_KEY to manage Jo4 links. Review requests before creating, updating, or deleting links, and avoid sharing raw analytics unless you are authorized to disclose visitor behavior data.

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 (4)

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 · README.md (reported line 18)May include surrounding context.

bash
# Shorten a URL
curl -X POST "https://jo4-api.jo4.io/api/v1/protected/url" \
  -H "X-API-Key: $JO4_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"longUrl": "https://example.com", "title": "My Link"}'

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 34)May include surrounding context.

Create Short URL (Authenticated)

bash
curl -X POST "https://jo4-api.jo4.io/api/v1/protected/url" \
  -H "X-API-Key: $JO4_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{

Missing User Warnings

Medium
Category
Not specified by scanner
Confidence
93% confidence
Finding

The skill exposes analytics and tracking capabilities, including geographic, device/browser, and referrer data, without any privacy notice or guidance on appropriate handling of visitor data. In an agent setting, this can normalize collection or disclosure of potentially sensitive behavioral data without user awareness or consent checks.

Content

No source excerpt is available for this finding.

Missing User Warnings

Medium
Category
Not specified by scanner
Confidence
95% confidence
Finding

The skill documents a destructive DELETE operation but provides no warning that deletion is irreversible or that the agent should confirm intent before executing it. In an agentic context, this increases the chance of accidental data loss from ambiguous or mistaken user prompts rather than a direct exploit.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.