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Security audit

jina-ai-reader

Security checks for vulnerabilities and agentic risk

Overview

This skill is a small URL-to-Markdown helper that openly uses Jina.ai Reader, with privacy caveats but no hidden persistence, credential access, or destructive behavior.

Install only if you are comfortable sending the requested URL to Jina.ai Reader. Do not use it for confidential documents, private intranet pages, signed URLs, URLs containing access tokens, or content where paywall or site terms matter.

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
  • 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
95% confidence
Finding

The skill performs network access to fetch remote content but does not declare any explicit tool scope or permissions boundary. This weakens reviewability and policy enforcement, increasing the chance the skill is invoked in contexts where users or orchestrators are not clearly informed that external network access will occur.

Content

No source excerpt is available for this finding.

Missing User Warnings

Medium
Category
Not specified by scanner
Confidence
98% confidence
Finding

The skill routes user-supplied URLs and retrieves page contents through the third-party Jina.ai Reader service, yet the description does not warn users that their requested targets and extracted content leave the local environment. This creates a privacy and data-handling risk, especially if users pass sensitive, internal, authenticated, or proprietary URLs/content assuming the skill behaves like a direct local fetcher.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.