ClawHub
Back to skill

Security audit

PostThatLater

Security checks for vulnerabilities and agentic risk

Overview

This skill is a transparent PostThatLater API guide with expected social-posting authority and no hidden code or deceptive behavior.

Install only if you intend to let the agent manage your PostThatLater account. Review actions before scheduling, editing, deleting, or publishing posts, and provide only image URLs you are comfortable sending to PostThatLater for storage and processing.

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
  • Rogue AgentSelf-Modification, Session Persistence
  • 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)

Session Persistence

Medium
Category
Rogue Agent
Confidence
60% confidence
Finding

Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.

Content

Scanner excerpt · SKILL.md (reported line 18)May include surrounding context.

md
## Setup

### 1. Create an account

Sign up at https://postthatlater.com — a subscription is required to use the API.

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 204)May include surrounding context.

Cannot delete posted posts (returns 409). Failed posts can be deleted.

bash
curl -X DELETE https://postthatlater.com/api/v1/posts/101 \
  -H "Authorization: Bearer $PTL_API_KEY"

Missing User Warnings

Medium
Category
Not specified by scanner
Confidence
95% confidence
Finding

The skill instructs the agent to submit arbitrary image URLs to the PostThatLater service for server-side download and storage, but it does not warn that the provided URL itself will be transmitted to a third party. This can expose private or sensitive URLs, including signed links, intranet references, or user-specific asset locations, and may cause users to unintentionally disclose data to the service.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.