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Security audit

Cursor

Security checks for vulnerabilities and agentic risk

Overview

The Cursor integration is clearly described, but its setup runs changeable remote software without clear approval or disclosure of broader agent changes.

Review and approve CLI installation separately. Check which agent skill files it installs or updates, and disable automatic skill synchronization if unwanted. OOMOL will mediate Cursor account access. Keep the skill's confirmation requirements for cloud-agent creation, other writes, and deletion. The remote installers' full effects 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 code performs remote installer execution, not Cursor data operations. Nothing in the supplied chunk establishes that installing the Oomol CLI is a supporting requirement for Cursor access. The downloaded script's contents and any further actions 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 command immediately executes a remotely fetched script without a pinned version or independent integrity verification; the PowerShell alternative has the same weakness. If the distribution endpoint or release pipeline is compromised, attacker-controlled code could execute with the agent process's local permissions and access available files or credentials. HTTPS and the missing-CLI condition reduce some exposure but do not protect against a compromised publisher.

Content

Scanner excerpt · SKILL.md (reported line 69)May include surrounding context.

First-time setup executes downloaded installation scripts without warning about local system changes.

Medium
Category
Output Handling
Confidence
91% confidence
Finding

The missing-command fallback directs the agent to install software without explicitly obtaining approval for local system changes or explaining the installer's scope. The conditional trigger limits exposure, but the confirmation rules cover Cursor state changes rather than local installation, leaving a consent gap.

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 90)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