Security audit

Heyzine

Security checks for vulnerabilities and agentic risk

Overview

The Heyzine skill is mostly coherent, but its setup instructions include unverified remote installer commands that could run arbitrary code if followed.

Review this skill before installing. It can read and modify Heyzine data through your connected OOMOL account, including deleting flipbooks, and it asks for confirmation before write or destructive actions. Do not let an agent run the remote installer commands automatically; install the oo CLI yourself from a trusted, verifiable source and only connect the Heyzine account you intend to manage.

A.I.G

Vulnerability Patterns

Remote Payload Retrieval and ExecutionFetches external code whose behavior can change after review
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
Embedded Malicious CodeShips malicious scripts inside the skill and executes them locally
Unauthorized Access and Privilege EscalationObtains permissions beyond the task's legitimate needs

Findings (2)

T03 · Remote Payload Retrieval and Execution

Error

Location: SKILL.md:63
Finding: Unverified Remote Shell Script Execution on macOS and Linux
Content: View full analysis
Remediation: View remediation

T03 · Remote Payload Retrieval and Execution

Error

Location: SKILL.md:67
Finding: Unverified Remote PowerShell Script Execution on Windows
Content: View full analysis
Remediation: View remediation

SkillSpector

Vulnerability Patterns

Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
Trigger AbuseOverly Broad Trigger, Shadow Command Trigger, Keyword Baiting Trigger
Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access

Findings (2)

External Script Fetching

High

Category: Supply Chain
Confidence: 96% confidence
Finding: The skill instructs the agent to install software via a remote script piped directly into a shell (curl ... | bash). This pattern is dangerous because it executes unpinned code fetched at runtime from an external server without integrity verification, creating a supply-chain compromise path if the host, network, or distribution endpoint is tampered with.
Content: Scanner excerpt · SKILL.md (reported line 63)May include surrounding context.

oo: command not found — install the oo CLI (other platforms: https://cli.oomol.com/install-guide.md):

bash
curl -fsSL https://cli.oomol.com/install.sh | bash # macOS / Linux

powershell

Vague Triggers

Medium

Category: Not specified by scanner
Confidence: 96% confidence
Finding: The manifest description uses an extremely broad activation condition: "Use this skill for ANY Heyzine request" and "Whenever a task involves Heyzine." For a markdown/manifest file, this lacks narrowing conditions or exclusion examples and could cause unintended invocation whenever Heyzine is merely mentioned.
Content: No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.