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Security audit

Storyblok

Security checks for vulnerabilities and agentic risk

Overview

The Storyblok reading workflow is coherent, but its fallback setup executes unverified internet installers without requiring user approval.

Review and explicitly approve CLI installation separately before allowing the agent to perform setup. Prefer a reviewed, version-pinned installation with integrity verification. Connect only the intended Storyblok account with appropriate read permissions, and understand that OOMOL mediates access. The external installer and CLI were not bundled for inspection.

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
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • 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
Findings (5)

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
99% confidence
Finding

The supplied command performs remote script execution, not Storyblok searching or reading. Nothing in the code establishes that installing the Oomol CLI is a supporting requirement for Storyblok access. The downloaded script's contents are not supplied, so its further behavior cannot be assessed.

Content

No source excerpt is available for this finding.

Credential Access

High
Category
Privilege Escalation
Confidence
70% confidence
Finding

Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.

Content

Scanner excerpt · SKILL.md (reported line 40)May include surrounding context.

md
## Available actions

- `get_space` — Retrieve metadata for the Storyblok space associated with the access token.
- `get_story` — Retrieve one Storyblok story by full slug, numeric ID, or UUID.
- `list_datasource_entries` — List Storyblok datasource entries, optionally filtered by datasource and dimension.
- `list_datasources` — List Storyblok datasources with pagination.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

Piping a live HTTPS response directly into Bash executes remote code without independently verifying its integrity or reviewing its contents; the PowerShell alternative has the same weakness. Compromise of the installer distribution infrastructure could therefore lead to arbitrary code execution with the agent's local permissions. The apparent vendor-domain alignment and conditional setup make malicious intent less likely, but do not remove the supply-chain risk.

Content

Scanner excerpt · SKILL.md (reported line 61)May include surrounding context.

The fallback setup instructs the agent to execute downloaded installer scripts without warning the user about local system changes.

Medium
Category
Output Handling
Confidence
95% confidence
Finding

When the CLI is missing, the skill directs the agent to execute an installer without first obtaining approval for local software installation. A request to read Storyblok data does not necessarily authorize local system changes, and the downloaded script could modify files or execute other commands with the agent's permissions. Restricting setup to a missing-command error reduces exposure but does not establish user consent.

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 82)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