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Security audit

Emailable

Security checks for vulnerabilities and agentic risk

Overview

The Emailable integration is coherent, but its setup permits unchecked remote code execution and does not explain broader changes its CLI can make to agent skills.

Review and approve a verified, pinned CLI installation before allowing setup. Consider setting OO_SKILLS_SYNC_DISABLED=1 before CLI use to prevent changes to other agent skills. Only verify addresses you are authorized to send through OOMOL to Emailable, and check applicable credit costs. The packaged instructions were fully inspected; remote installer contents and the installed CLI version remain unverified.

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
99% confidence
Finding

The supplied command performs remote script execution for an Oomol installer, with no visible Emailable API interaction or demonstrated connection to the declared purpose. This is an undeclared installation capability, not an established supporting implementation detail. The downloaded script's contents and downstream effects cannot be determined from this snippet.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

The installation command streams a mutable remote script directly into a shell without a pinned version or independent integrity verification; the PowerShell alternative has the same weakness. If the distribution endpoint or release infrastructure is compromised, installation can execute attacker-controlled code with the invoking user's privileges, potentially exposing local files and credentials. The missing-CLI condition limits when this occurs but does not make the execution safe.

Content

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

The safety guidance permits direct email verification without warning that email addresses are sent to third-party services.

Medium
Category
Output Handling
Confidence
88% confidence
Finding

The untagged verify_email action falls under the instruction that untagged actions are safe to run directly. Although the skill identifies the OOMOL/Emailable integration, it never warns that verification transmits the supplied email addresses through OOMOL to Emailable; confirmation for state-changing actions does not cover this privacy impact.

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