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Security audit

Investoday MCP

Security checks for vulnerabilities and agentic risk

Overview

The financial-data workflow is coherent, but its setup instructions can trigger unverified remote code execution without separate user approval.

Review before installing. Use an independently verified oo CLI installation and require approval before any downloaded installer runs. Expect queries to pass through OOMOL using your connected Investoday account. The artifact supports an installation-control concern, but does not establish malicious behavior; external installer effects remain unknown.

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 (5)

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
99% confidence
Finding

The supplied command performs remote script execution for an apparent CLI installation, not Investoday data searching or reading. The description does not disclose installation behavior or establish Oomol as a required supporting dependency. The downloaded script is not supplied, so its further effects cannot be determined.

Content

No source excerpt is available for this finding.

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
84% confidence
Finding

The supplied code performs only authentication, rather than the declared Investoday search-and-read functionality. Authentication could be a supporting implementation detail, but this chunk provides no evidence that oo auth login authenticates to Investoday or supports an Investoday operation. The assessment is limited to the supplied chunk.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

Piping an HTTPS response directly into bash executes mutable remote content without a pinned version, signature check, or opportunity to review the downloaded artifact. A compromised installer host or publishing pipeline could execute arbitrary commands and access files or credentials available to the agent; HTTPS alone does not protect against those compromises.

Content

Scanner excerpt · SKILL.md (reported line 329)May include surrounding context.

The setup workflow executes downloaded installation scripts without warning about remote code execution or system changes.

Medium
Category
Output Handling
Confidence
96% confidence
Finding

The fallback setup directs the agent to execute remotely downloaded shell or PowerShell code without explaining the arbitrary-code-execution risk or requesting approval for installation. Although limited to a missing-CLI condition, this can turn a financial-data lookup into execution of code with the agent process's local permissions.

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 350)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