Back to skill

Security audit

Moosend

Security checks for vulnerabilities and agentic risk

Overview

The Moosend workflow has clear safeguards, but its setup instructions allow remote code execution and broader agent changes without clear user approval.

Review and approve CLI installation separately before allowing the agent to perform it. Prefer a pinned, verified release, and review the CLI's automatic skill installation behavior; the vendor documents OO_SKILLS_SYNC_DISABLED as an opt-out in its [command reference](https://github.com/oomol-lab/oo-cli/blob/main/docs/commands.md). Understand that OOMOL intermediates subscriber requests and manages the connected Moosend credentials. The remote installer and hosted implementation were not verified; the bundled artifact shows no evidence of malicious intent.

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
Vulnerability Patterns
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
  • Output HandlingUnvalidated Output Injection, Cross-Context Output, Unbounded Output
  • MCP Tool PoisoningHidden Instructions, Unicode Deception, Parameter Description Injection
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
Findings (4)

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
95% confidence
Finding

The supplied code performs remote software installation rather than any visible Moosend operation. Although dependency installation can be a supporting implementation detail, this chunk provides no evidence that the Oomol installer supports the declared Moosend purpose. The downloaded script's contents and further effects cannot be determined from the supplied code.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
97% confidence
Finding

The curl-to-bash command executes mutable remote content with the invoking user's permissions, without a pinned version or integrity verification. Compromise of the installation host or distribution pipeline could therefore yield local code execution and access to files or credentials; HTTPS and the legitimate dependency relationship do not eliminate that risk.

Content

Scanner excerpt · SKILL.md (reported line 58)May include surrounding context.

Fallback setup executes downloaded installation scripts without warning about running remote code or modifying the local system.

Medium
Category
Output Handling
Confidence
94% confidence
Finding

The missing-CLI fallback directs installation through immediate execution of downloaded scripts, without requiring informed user approval for executing remote code and modifying the local system. Restricting this to a missing dependency reduces exposure, but it does not establish consent or verify the downloaded code.

Content

No source excerpt is available for this finding.

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 79)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