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Security audit

JSONBin.io

Security checks for vulnerabilities and agentic risk

Overview

The JSONBin workflow has clear safeguards, but its setup instructions can trigger unverified remote code execution without separate user approval.

Review setup before installing. Install a verified CLI version yourself and check its automatic skill synchronization before allowing agent use. OOMOL mediates JSONBin requests and holds the connected API key, so consider whether you trust it with that access. Keep the skill's explicit approvals for writes and deletions. The entire bundled artifact was reviewed, but external installer code and hosted connector behavior remain outside that 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
  • 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 does not perform any JSONBin.io operation. It executes a remote installer from cli.oomol.com, with no demonstrated connection to the declared JSONBin.io functionality. This is an undeclared capability and accesses an inconsistent resource. The contents and further effects of the downloaded script cannot be determined from the supplied chunk.

Content

No source excerpt is available for this finding.

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
95% confidence
Finding

The supplied code only invokes a login command; it contains no JSONBin.io operations or evidence linking this authentication step to JSONBin.io. Authentication could be a supporting implementation detail if that connection were established, but the supplied chunk does not establish it.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

Piping the HTTPS response directly into bash executes a mutable remote script without prior inspection or verification of a specific artifact. Compromise of the installer hosting or release pipeline could enable file modification, credential theft, or other actions available to the executing account; HTTPS alone does not protect against those compromises.

Content

Scanner excerpt · SKILL.md (reported line 58)May include surrounding context.

The setup workflow instructs the agent to execute downloaded installer scripts without warning about the system-integrity implications.

Medium
Category
Output Handling
Confidence
96% confidence
Finding

The fallback setup instructs immediate execution of downloaded shell or PowerShell code without an integrity check or explicit approval for the installation's local effects. Although conditional on a missing CLI and relevant to the task, this can turn dependency setup into arbitrary code execution with the agent's privileges if the installer distribution is compromised.

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 79)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