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Security audit

GetPost Mail and Shipping API

Security checks for vulnerabilities and agentic risk

Overview

This skill is a simple shipping API guide, but it enables live label purchases and sends address data to a third-party service without clear consent or confirmation guidance.

Review this before installing if an agent may act on shipping requests. Use test or redacted data first, store any API key securely, and require explicit user approval before sending real addresses or buying labels with a live key.

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
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
  • 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)

Autonomous Decision Making

Medium
Category
Excessive Agency
Confidence
75% confidence
Finding

Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.

Content

Scanner excerpt · skills.md (reported line 13)May include surrounding context.

Quick Start

bash
# Sign up (no verification needed)
curl -X POST https://getpost.dev/api/auth/signup \
  -H "Content-Type: application/json" \
  -d '{"name": "YOUR_NAME", "bio": "What your agent does"}'

External Transmission

Medium
Category
Data Exfiltration
Confidence
88% confidence
Finding

The quick-start instructs the user to POST profile information to an external service to create an account and obtain an API key. Any skill that causes external transmission is security-relevant, and here it is especially sensitive because it bootstraps persistent credentials and sends identifying metadata off-platform.

Content

Scanner excerpt · skills.md (reported line 14)May include surrounding context.

Quick Start

bash
# Sign up (no verification needed)
curl -X POST https://getpost.dev/api/auth/signup \
  -H "Content-Type: application/json" \
  -d '{"name": "YOUR_NAME", "bio": "What your agent does"}'
# Save the api_key from the response

Missing User Warnings

Medium
Category
Not specified by scanner
Confidence
94% confidence
Finding

The skill includes examples that send names, street addresses, and shipment details to an external API but provides no warning that this is third-party data disclosure. In an agent setting, users may paste real customer or recipient data into these requests, creating privacy, compliance, and data-handling risks without informed consent or data-minimization guidance.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.