MailWizz

• Outcome: Review
• Latest audit: Nov 3, 2026 · 10:59 AM UTC
• Version: 1.0.4

Overview

MailWizz changes require approval, but setup executes unverified remote code and omits the CLI’s documented installation of additional agent skills.

Review and verify the CLI installer separately before allowing setup. Consider setting OO_SKILLS_SYNC_DISABLED=1 before CLI use to prevent the documented startup skill synchronization. Connect only the intended MailWizz account, understand that OOMOL processes connector requests, and retain the required approval for subscriber changes. Remote installer behavior remains unverified.

A.I.G

Vulnerability Patterns

• Skill Instruction Hijacking: Alters the agent's session goals or safety constraints when the skill loads
• Agent Memory Poisoning: Writes attacker-controlled rules into memory that affect later sessions
• Remote Payload Retrieval and Execution: Fetches external code whose behavior can change after review
• Embedded Malicious Code: Ships malicious scripts inside the skill and executes them locally
• Unauthorized Access and Privilege Escalation: Obtains permissions beyond the task's legitimate needs

SkillSpector

Vulnerability Patterns

• Supply Chain: Unpinned Dependencies, External Script Fetching, Obfuscated Code
• Excessive Agency: Unrestricted Tool Access, Autonomous Decision Making, Scope Creep
• MCP Tool Poisoning: Hidden Instructions, Unicode Deception, Parameter Description Injection
• Prompt Injection: Instruction Override, Hidden Instructions, Exfiltration Commands
• Data Exfiltration: External Transmission, Env Variable Harvesting, File System Enumeration

Findings (3)

Description-Behavior Mismatch

High

• Category: MCP Tool Poisoning
• Confidence: 95% confidence

Finding

The visible behavior is remote installer execution rather than MailWizz data management. Installing a dependency could be a supporting implementation detail, but the supplied chunk establishes no such relationship to MailWizz. The downloaded script's contents are unavailable, so its further actions cannot be determined.

Content

No source excerpt is available for this finding.

External Script Fetching

High

• Category: Supply Chain
• Confidence: 98% confidence

Finding

The setup command streams a mutable remote script directly into Bash without verifying its integrity or reviewing it; the PowerShell alternative has the same weakness. Compromise of the distribution infrastructure could execute attacker-controlled code with the invoking user's permissions, exposing local files and credentials. The legitimate dependency and missing-CLI prerequisite reduce suspicion of malicious intent, but do not remove this supply-chain risk.

Content

Scanner excerpt · SKILL.md (reported line 60)May include surrounding context.

• oo: command not found — install the oo CLI (other platforms: https://cli.oomol.com/install-guide.md):

  bash

  curl -fsSL https://cli.oomol.com/install.sh | bash    # macOS / Linux
  

  powershell

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 81)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