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Security audit

Omise

Security checks for vulnerabilities and agentic risk

Overview

Omise operations have clear approval safeguards, but setup can execute unverified downloads and introduce broader changes to installed agent skills.

Review setup before enabling the skill. Prefer a reviewed, pinned CLI installation and explicitly control any bundled-skill deployment across your agents. Connect only the Omise access needed and retain confirmation for customer changes and deletion. The bundled instructions were fully inspected; remote installer contents and hosted credential handling 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
98% confidence
Finding

The supplied chunk performs remote installer execution rather than Omise data operations. Although dependency installation can be a supporting implementation detail, the chunk provides no evidence that this Oomol installer supports Omise functionality. The downloaded script's contents and further effects are not available for assessment.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

The curl-to-bash command immediately executes mutable remote content without verifying a pinned version or trusted signature. HTTPS protects transport but does not prevent a compromised installer host or publishing pipeline from delivering malicious code that could access local files and credentials.

Content

Scanner excerpt · SKILL.md (reported line 63)May include surrounding context.

First-time setup instructs execution of remote installation scripts without a security warning.

Medium
Category
Output Handling
Confidence
96% confidence
Finding

The setup instructions pipe downloaded shell and PowerShell scripts directly into interpreters without review, integrity verification, or explicit installation approval. If the distribution infrastructure is compromised, following these instructions could execute attacker-controlled code with the agent's local permissions; making installation conditional reduces exposure but does not eliminate the risk.

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 84)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