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Security audit

Plasmic

Security checks for vulnerabilities and agentic risk

Overview

The Plasmic reads fit the stated purpose, but setup can execute downloaded code and introduce persistent agent changes without a clear approval step.

Review and approve CLI installation separately before allowing setup. Use an inspected, verified release and consider the publisher-documented OO_SKILLS_SYNC_DISABLED control to prevent automatic skill synchronization. Connect only the Plasmic account and permissions needed, recognizing that OOMOL handles the connection. The bundled read workflow is coherent; the material concerns are setup execution and undisclosed persistent agent changes. Remote installer behavior remains 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 apparent Oomol CLI installation, not Plasmic data searching or reading. Nothing in the supplied chunk establishes this installation as a supporting requirement for Plasmic access. The downloaded script's contents are not provided, so its further behavior cannot be determined.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

The command pipes a mutable network response directly into Bash without independently verifying its integrity or authenticity; the PowerShell alternative has the same weakness. If the distribution endpoint or delivery infrastructure is compromised, following these instructions could execute attacker-controlled code with the invoking user's permissions, exposing local files and credentials even though Plasmic tokens are handled server-side.

Content

Scanner excerpt · SKILL.md (reported line 56)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
94% confidence
Finding

The missing-CLI fallback directs installation through remote script execution without explaining that this runs external code and may modify the local environment. Although conditional setup reduces exposure, a request to read Plasmic data does not itself constitute informed approval for installing software; this is a consent weakness in the same workflow flagged by SC2.

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 77)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