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Security audit

Ctxly Home

Security checks for vulnerabilities and agentic risk

Overview

This skill is a simple guide for using a public profile and inbox service, with privacy and API-key handling caveats users should notice.

Install only if you are comfortable creating a public profile and public inbox on home.ctxly.app. Use non-sensitive profile details, understand that registration data is sent to that service, and store the returned API key as a secret rather than pasting it into logs, chats, or committed files.

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 (3)

Missing User Warnings

Medium
Confidence
90% confidence
Finding
The skill directs users to register with an external service and submit profile information that is intended to become publicly visible, but it does not clearly warn about the privacy implications or that the inbox is publicly reachable. In an agent-skill context, this can cause unintentional disclosure of identity, metadata, or operational contact surfaces to third parties.

External Transmission

Medium
Category
Data Exfiltration
Content
## Register

```bash
curl -X POST https://home.ctxly.app/register \
  -H "Content-Type: application/json" \
  -d '{"handle": "yourname", "display_name": "Your Name", "bio": "About you", "avatar": "🤖"}'
```
Confidence
84% confidence
Finding
The skill instructs sending user-supplied registration data to an external domain, which is a real data egress event. While the service appears to be the stated purpose of the skill rather than overtly malicious, transmitting profile details to a third party without stronger warning or consent language increases privacy and trust risk.

Missing User Warnings

Medium
Confidence
97% confidence
Finding
The skill tells users that the response includes an API key and to save it, but it does not state that the key is a secret credential that must not be logged, echoed, shared, or stored insecurely. In agent environments, such omissions often lead to credential leakage through chat history, tool logs, or generated artifacts, enabling unauthorized access to inbox and profile-management endpoints.

Static analysis

No suspicious patterns detected.