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Security audit

viator-mcp

Security checks for vulnerabilities and agentic risk

Overview

This skill is a disclosed Viator search connector that requires a user-provided API key and does not show booking, deletion, exfiltration, or hidden persistence behavior in the reviewed artifact.

Before installing, verify that you trust the third-party npm package or GitHub source, and use a Viator Partner API key intended for this connector. Expect the MCP config entry and API key environment setting to remain until you remove them.

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
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
  • 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 (3)

MCP Config Access

High
Category
Agent Snooping
Confidence
95% confidence
Finding

Skill accesses MCP server configuration files (mcp.json). MCP configs contain server URLs, authentication tokens, and tool definitions — reading them allows the skill to discover and potentially abuse other tool integrations.

Content

Scanner excerpt · SKILL.md (reported line 20)May include surrounding context.

Option A — npx (recommended)

Add to .mcp.json in your project or ~/.claude/mcp.json:

json
{

MCP Config Access

High
Category
Agent Snooping
Confidence
90% confidence
Finding

Skill accesses MCP server configuration files (mcp.json). MCP configs contain server URLs, authentication tokens, and tool definitions — reading them allows the skill to discover and potentially abuse other tool integrations.

Content

Scanner excerpt · SKILL.md (reported line 47)May include surrounding context.

npm install && npm run build

text

Then point `.mcp.json` at `dist/index.js` with `VIATOR_API_KEY` in `env`.

## Workflow

Autonomous Decision Making

Medium
Category
Excessive Agency
Confidence
75% confidence
Finding

Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.

Content

Scanner excerpt · SKILL.md (reported line 76)May include surrounding context.

md
## Response shape

Every read tool — all ten of them — takes `view: "compact" | "full"`, and
**`compact` is the default**, so the smaller payload is what you get without
asking for it. Pass `view: "full"` for Viator's untouched record.

What `compact` *does* differs by tool, because only two of them have a field

Static analysis

No suspicious patterns detected.