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Security audit

Cartes.io

Security checks for vulnerabilities and agentic risk

Overview

The Cartes.io actions have sensible safeguards, but the required CLI can install persistent skills for other agents without disclosure here.

Review the CLI's installation and automatic skill synchronization before allowing setup. It can affect agent behavior beyond Cartes.io; publisher documentation describes OO_SKILLS_SYNC_DISABLED for disabling startup synchronization. Use a reviewed CLI release and retain the skill's approval requirements for changes and deletions. The remote installer itself remains unverified.

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
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
  • MCP Tool PoisoningHidden Instructions, Unicode Deception, Parameter Description Injection
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
Findings (3)

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
99% confidence
Finding

The supplied code executes an Oomol-hosted installer and contains no Cartes.io interactions. Nothing in the description or code establishes this installation as a supporting dependency for Cartes.io functionality. The remote script's exact effects cannot be determined from this chunk, but its download and execution are directly observable and outside the declared purpose.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

The installation command executes a mutable remote script immediately without a pinned version or independent integrity verification; the PowerShell alternative has the same weakness. Compromise of the script distribution infrastructure could execute arbitrary code with the agent's local privileges, exposing accessible credentials and files. Its legitimate setup purpose and missing-CLI trigger reduce exposure but do not remove the supply-chain risk.

Content

Scanner excerpt · SKILL.md (reported line 72)May include surrounding context.

Autonomous Decision Making

Medium
Category
Excessive Agency
Confidence
80% 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 93)May include surrounding context.

md
- **`OOMOL_INSUFFICIENT_CREDIT`** — OOMOL billing stop. Recharge at `https://console.oomol.com/billing/token-recharge` before retrying.

- **HTTP 402 without `OOMOL_INSUFFICIENT_CREDIT`** — the third-party account itself has no active plan or credit. Report the provider error message as is; do not ask the user to recharge OOMOL.

## Resources