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Security audit

Auth0 Fastify Api

Security checks for vulnerabilities and agentic risk

Overview

This skill is a straightforward Auth0/Fastify setup guide and does not show hidden or disproportionate behavior.

Install this only for a Fastify REST API that should validate Auth0 JWT access tokens. Review the npm packages and Auth0 CLI action before running them, because the CLI example creates an API resource in your Auth0 tenant, but the skill does not ask for secrets or hidden access.

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
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
Findings (5)

Credential Access

High
Category
Privilege Escalation
Confidence
70% confidence
Finding

Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.

Content

Scanner excerpt · SKILL.md (reported line 3)May include surrounding context.

md
---
name: auth0-fastify-api
description: Use when securing Fastify API endpoints with JWT Bearer token validation, scope/permission checks, or stateless auth - integrates @auth0/auth0-fastify-api for REST APIs receiving access tokens from frontends or mobile apps.
license: Apache-2.0
metadata:
  author: Auth0 <support@auth0.com>

Credential Access

High
Category
Privilege Escalation
Confidence
70% confidence
Finding

Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.

Content

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

md
# Auth0 Fastify API Integration

Protect Fastify API endpoints with JWT access token validation using @auth0/auth0-fastify-api.

---

Credential Access

High
Category
Privilege Escalation
Confidence
70% confidence
Finding

Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.

Content

Scanner excerpt · SKILL.md (reported line 128)May include surrounding context.

md
# Auth0 Fastify API Integration

Protect Fastify API endpoints with JWT access token validation using @auth0/auth0-fastify-api.

---

Credential Access

High
Category
Privilege Escalation
Confidence
70% confidence
Finding

Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.

Content

Scanner excerpt · SKILL.md (reported line 144)May include surrounding context.

md
# Auth0 Fastify API Integration

Protect Fastify API endpoints with JWT access token validation using @auth0/auth0-fastify-api.

---

Credential Access

High
Category
Privilege Escalation
Confidence
70% confidence
Finding

Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.

Content

Scanner excerpt · SKILL.md (reported line 184)May include surrounding context.

md
- [Auth0 Fastify API Documentation](https://auth0.com/docs/quickstart/backend/fastify)
- [SDK GitHub Repository](https://github.com/auth0/auth0-fastify)
- [Access Tokens Guide](https://auth0.com/docs/secure/tokens/access-tokens)

Static analysis

No suspicious patterns detected.