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Security audit

PixelLab

Security checks for vulnerabilities and agentic risk

Overview

The PixelLab workflow is coherent, but its automatic setup can execute unverified downloaded code and introduce additional persistent agent skills.

Review setup before enabling this skill. Install a reviewed, fixed CLI release separately and retain approval for writes and deletions. To prevent additional agent skills being installed or refreshed, upstream documents setting OO_SKILLS_SYNC_DISABLED=1 before CLI use in its [command reference](https://github.com/oomol-lab/oo-cli/blob/main/docs/commands.md#environment-variables). Requested content passes through OOMOL and PixelLab and may consume credits. The bundled instructions were fully inspected; external installer code and hosted connector behavior 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
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
  • 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
97% confidence
Finding

The supplied code performs remote installer execution rather than PixelLab data operations. Although installation can be a supporting implementation detail, nothing supplied establishes this Oomol installer as a dependency of the declared PixelLab functionality. The downloaded script's further behavior cannot be determined from this chunk.

Content

No source excerpt is available for this finding.

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
81% confidence
Finding

The only supplied command performs CLI login and contains no identifiable PixelLab integration or data operations. Authentication could support a PixelLab implementation, but no such connection is shown here; the supplied chunk's primary behavior therefore differs from the declared purpose.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

The setup command pipes a mutable remote script directly into Bash without version pinning, integrity verification, or review; the PowerShell alternative uses the same download-and-execute pattern. Compromise of the installer distribution path could execute arbitrary code with the agent process's permissions, exposing local files and credentials. Installation is conditional on a missing CLI, which limits exposure but does not establish trust in the downloaded code.

Content

Scanner excerpt · SKILL.md (reported line 110)May include surrounding context.

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 131)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

External Transmission

Medium
Category
Data Exfiltration
Confidence
50% confidence
Finding

Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

Content

Scanner excerpt · SKILL.md (reported line 136)May include surrounding context.

md
## Resources

- PixelLab homepage: https://www.pixellab.ai/
- API documentation: https://api.pixellab.ai/v2/docs