Security audit

Web Fetcher

Security checks for vulnerabilities and agentic risk

Overview

This web-fetcher is purpose-aligned, but users should avoid using it with private, signed, or token-bearing URLs because it sends URLs to third-party conversion services.

Install only if you are comfortable sending target URLs to r.jina.ai, markdown.new, and defuddle.md. Do not use it for password reset links, signed download URLs, private document shares, API keys in query strings, or pages that require your logged-in browser session unless you intentionally want the agent to inspect that page.

A.I.G

Vulnerability Patterns

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
Embedded Malicious CodeShips malicious scripts inside the skill and executes them locally

Findings (2)

T09 · Insecure Skill Coding Practices

Warning

Location: scripts/fetch_url.py:12
Finding: Disclosure of Sensitive URLs to Third-Party Conversion Services
Content: View full analysis
Remediation: View remediation

T09 · Insecure Skill Coding Practices

Warning

Location: scripts/fetch_url.py:18
Finding: Unbounded HTTP Response Buffering Can Exhaust Process Memory
Content: View full analysis
Remediation: View remediation

SkillSpector

Vulnerability Patterns

Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
MCP Least PrivilegeUnderdeclared Capability, Wildcard Permission, Missing Permission Declaration
Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code

Findings (2)

Undeclared Tool Scope

Medium

Category: MCP Least Privilege
Confidence: 92% confidence
Finding: The skill instructs network-based retrieval from multiple external services and browser/search fallbacks, but it does not declare any explicit tool scope, permissions, or allowed-tools boundary. That mismatch can cause the runtime or orchestrator to grant broader network access than users expect, increasing the risk of unintended outbound requests, data exfiltration via fetch targets, or use of unreviewed retrieval paths.
Content: No source excerpt is available for this finding.

Missing User Warnings

Medium

Category: Not specified by scanner
Confidence: 89% confidence
Finding: The script fetches arbitrary user-supplied URLs and relays the retrieved content through third-party proxy services without any validation, restriction, or disclosure. In an agent setting, this can enable SSRF-style access to internal resources, unexpected transmission of sensitive URLs to external services, and retrieval of untrusted content from destinations the user may not realize are being contacted.
Content: No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.