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Security audit

Tinybird

Security checks for vulnerabilities and agentic risk

Overview

The Tinybird workflow is coherent, but its fallback tells your agent to run an unverified remote installer without asking first.

Review and approve CLI installation separately before letting the agent use this skill. Prefer a pinned, verified release and check whether setup adds or updates other agent skills. Connect Tinybird with only the read permissions needed, and understand that requests pass through OOMOL. The remote installer and live connector implementation were not verified.

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 code performs remote installer execution and contains no visible Tinybird search or read functionality. Nothing in the supplied material establishes this installer as a supporting dependency for Tinybird access. The downloaded script's contents are unavailable, so its further behavior cannot be determined.

Content

No source excerpt is available for this finding.

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
88% confidence
Finding

The supplied chunk only invokes an authentication command; it contains no Tinybird search, read, or integration behavior. Authentication could be a supporting implementation detail if the CLI were established as part of the Tinybird workflow, but the supplied content provides no such connection.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

The command pipes a mutable remote script directly into Bash without independently verifying its integrity or reviewing it; the PowerShell alternative has the same execution pattern. If the distribution endpoint or publishing pipeline is compromised, attacker-controlled code executes with the agent process's local permissions, potentially exposing files and credentials. HTTPS and the legitimate dependency context reduce some risks but do not establish the script's integrity.

Content

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

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

Medium
Category
Output Handling
Confidence
94% confidence
Finding

A missing CLI triggers instructions to install software locally without first obtaining approval for the system changes. A request to read Tinybird data does not inherently authorize executing an installer; the error-triggered fallback limits exposure but still crosses that authorization boundary.

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