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Security audit

Nilyo

Security checks for vulnerabilities and agentic risk

Overview

This skill clearly discloses that it gives an agent broad access to the user's connected messaging, email, calendar, and social accounts through Nilyo.

Install only if you are comfortable letting Nilyo and the agent access and act through the accounts you connect. Connect the minimum needed accounts, confirm any webhook URL belongs to you, prefer secure OAuth or connection links, and revoke account access or delete webhook destinations when no longer needed.

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 (1)

Scope Creep

Low
Category
Excessive Agency
Confidence
70% confidence
Finding

Skill's behavior or capabilities extend beyond its stated purpose. Scope creep allows an agent to perform actions unrelated to its documented functionality, increasing the attack surface.

Content

Scanner excerpt · SKILL.md (reported line 11)May include surrounding context.

md
## What the user is authorizing
Say this before the first connection, in your own words, and do not skip it:

- Each account the user connects lets the agent **read and send on their behalf**: private conversations, email bodies and attachments, contacts, calendar events, and publishing on LinkedIn and Instagram. It is not read-only and it is not limited to public data.
- Account content passes through Nilyo's servers to reach the agent, and through the agent's own runtime, which keeps its own conversation history.
- A realtime destination created with `webhook_create_destination` **forwards their account events to the URL they give**, continuously, until they remove it. Confirm the URL belongs to them.
- The user can disconnect any account or revoke the authorization at any time from their Nilyo account.