T08 · Insecure Dependencies
Warning
- Location
README.md:33- Finding
Unpinned Third-Party Installer and Mutable Repository Source
- Content
View full analysis
- Remediation
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Security audit
API Design Principles
Security checks for vulnerabilities and agentic risk
Overview
The skill itself is mostly API-design documentation, but its README recommends an unpinned executable install command from a mutable GitHub branch, which users should review before installing.
Review the install path before using this skill. Prefer installing from a pinned commit, verified archive, or trusted local copy instead of running the README's unpinned `npx add` command. If you copy the FastAPI template into a real service, replace wildcard CORS with explicit allowed origins and review destructive CRUD endpoints before deployment.
Vulnerability Patterns
- Insecure DependenciesIntroduces malicious components through unsafe dependency sources
- Insecure Skill Coding PracticesFinds exploitable flaws such as hardcoded secrets or command injection
- 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
Findings (2)
T09 · Insecure Skill Coding Practices
Note
- Location
templates/fastapi-template.py:20- Finding
Unrestricted CORS Configuration in a Production-Labeled API Template
- Content
View full analysis
- Remediation
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Vulnerability Patterns
- Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
- Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
- Tool MisuseTool Parameter Abuse, Chaining Abuse, Unsafe Defaults
- Rogue AgentSelf-Modification, Session Persistence
- Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
Findings (8)
Tool Parameter Abuse
High
- Category
- Tool Misuse
- Confidence
- 80% confidence
- Finding
Tool parameters are crafted to achieve unintended or unsafe behavior. Parameter abuse can bypass intended safety checks (e.g. shell=True, --force, dangerous glob patterns).
- Content
md GET /api/resources/{id} → Get one PUT /api/resources/{id} → Replace PATCH /api/resources/{id} → Partial update DELETE /api/resources/{id} → Remove # Nested (max 1 level) GET /api/users/{id}/orders → User's orders
Tool Parameter Abuse
High
- Category
- Tool Misuse
- Confidence
- 80% confidence
- Finding
Tool parameters are crafted to achieve unintended or unsafe behavior. Parameter abuse can bypass intended safety checks (e.g. shell=True, --force, dangerous glob patterns).
- Content
md |-------|-------| | `POST /getUsers` | `GET /users` | | `GET /createUser` | `POST /users` | | `POST /users/delete/123` | `DELETE /users/123` | | `/user/123` | `/users/123` (plural) | | `/api/users/123/orders/456/items` | Max 2 levels | | 200 for everything | Correct status codes |
Rp1
Medium
- Category
- MCP Rug Pull
- Confidence
- 70% confidence
- Finding
npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.
- Content
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
From your project root:
bash mkdir -p .cursor/skills cp -r ~/.ai-skills/skills/backend/api-design-principles .cursor/skills/api-design-principles
Skill Enumeration
Medium
- Category
- Agent Snooping
- Confidence
- 85% confidence
- Finding
Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.
- Content
From your project root:
bash mkdir -p .claude/skills cp -r ~/.ai-skills/skills/backend/api-design-principles .claude/skills/api-design-principles
Skill Enumeration
Medium
- Category
- Agent Snooping
- Confidence
- 85% confidence
- Finding
Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.
- Content
Claude Code (global)
bash mkdir -p ~/.claude/skills cp -r ~/.ai-skills/skills/backend/api-design-principles ~/.claude/skills/api-design-principles
External Model or Provider Selection
Medium
- Category
- Excessive Agency
- Confidence
- 90% confidence
- Finding
Skill selects an external model or provider that may use a different account or billing plan than the operator expects. Undisclosed model switches can cause unexpected cost or quota consumption.
- Content
md --- name: api-design-principles model: reasoning --- # API Design Principles
Missing User Warnings
Low
- Category
- Not specified by scanner
- Confidence
- 81% confidence
- Finding
This code defines a DELETE endpoint for user removal, which is a destructive and potentially irreversible action. Although the docstring states the HTTP response behavior, it does not provide any user warning, confirmation step, or explicit disclosure about the impact of deletion.
- Content
Static analysis
No suspicious patterns detected.