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Security audit

zillow-fpx

Security checks for vulnerabilities and agentic risk

Overview

The skill’s Zillow searches and saved-property access fit its stated purpose, with browser-session use and persistent pairing openly disclosed.

Approve only Zillow access and the required fetch capability. Address queries reach Zillow through your browser session, and saved-home results contain private account data. Protect temporary output files and revoke pairing when finished. Verify the external CLI and extension before installing; this review covers the bundled instructions, not those dependencies.

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
  • Output HandlingUnvalidated Output Injection, Cross-Context Output, Unbounded Output
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
Findings (1)

The address-resolution workflow sends address queries to Zillow without a privacy warning.

Medium
Category
Output Handling
Confidence
88% confidence
Finding

The workflow instructs the agent to submit a free-text address to Zillow in both the GraphQL request body and URL query string. Although it documents that the bridge supplies the session, it does not warn users that their address queries are disclosed to a third-party service using that session.

Content

No source excerpt is available for this finding.