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Security audit

GPTZero

Security checks for vulnerabilities and agentic risk

Overview

The GPTZero workflow is coherent, but its CLI dependency can automatically install other agent skills without clear notice in this skill.

Review the CLI's broader skill installation behavior before allowing setup. Its documented OO_SKILLS_SYNC_DISABLED=1 setting disables startup synchronization; installer behavior needs separate review. Prefer a verified, pinned installation and submit only text you are authorized to share with OOMOL and GPTZero. The exact remote installers remain unverified; no malicious payload was established.

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 (5)

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
99% confidence
Finding

The supplied command performs remote software installation, not GPTZero searching or reading. Nothing in the provided chunk establishes that installing the Oomol CLI is a necessary supporting step for GPTZero access, and remote script execution is not disclosed in the declared purpose. 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
86% confidence
Finding

The supplied code contains only a login command, with no GPTZero-specific resource selection, search, or read operation. Authentication could support a GPTZero integration, but no such integration is present in this chunk; its entire observable purpose is login rather than the declared data-access functionality.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

The setup command executes a mutable remote script directly in Bash without verifying its contents, signature, or a pinned digest; the PowerShell alternative follows the same pattern. Compromise of the distribution endpoint or release process could therefore execute arbitrary code with the invoking user's privileges, although the missing-CLI condition limits when this path is reached.

Content

Scanner excerpt · SKILL.md (reported line 55)May include surrounding context.

The workflow permits sending document text to GPTZero without a privacy warning.

Medium
Category
Output Handling
Confidence
93% confidence
Finding

The workflow instructs the agent to execute connector actions, and its sole action analyzes document text using GPTZero. Calling all untagged actions reads that are safe to run directly overlooks the disclosure of potentially sensitive document content to a third-party service; the skill never explicitly warns users about this transmission.

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 76)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