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Security audit

GetPost SMS API

Security checks for vulnerabilities and agentic risk

Overview

This is a straightforward SMS API reference skill, but users should treat phone numbers, message bodies, and API keys as sensitive.

Install only if you intend to use getpost.dev for SMS. Keep the API key in secure secret storage, get recipient consent before sending messages, avoid logging message bodies or phone numbers unnecessarily, and review the provider's privacy, telecom, billing, and webhook security practices.

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
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 (4)

Missing User Warnings

Medium
Category
Not specified by scanner
Confidence
91% confidence
Finding

This skill documents sending, receiving, and webhook delivery of SMS messages but provides no guidance on handling personal data, consent, retention, or securing inbound message content. Because SMS content and phone numbers are sensitive data, omission of these safeguards can lead agents to collect, transmit, and expose user communications insecurely.

Content

No source excerpt is available for this finding.

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
78% confidence
Finding

The skill instructs users to send identifying metadata ('name' and 'bio') to an external third-party service and then store an issued live API key, but it does not warn about trust boundaries, key handling, or data-sharing implications. In an agent setting, this can result in unreviewed exfiltration of agent/operator information and insecure credential handling.

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

Natural-Language Policy Violations

Low
Category
Not specified by scanner
Confidence
72% confidence
Finding

The examples and provisioning parameters are fixed to a US phone number and country value, which can imply a default locale choice rather than a user-selected one. Because the document does not state that this is merely an example or offer locale alternatives, it risks imposing a specific locale without opt-in.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.