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Security audit

Trello

Security checks for vulnerabilities and agentic risk

Overview

The Trello workflow includes clear approval safeguards, but setup can execute an unverified remote installer automatically.

Review setup before installing. Install a reviewed, pinned CLI separately and check its automatic agent-skill installation behavior. OOMOL will mediate access to the connected Trello account; connect only the intended account and retain the stated approval requirements for changes. The concern is installation control, with no artifact-backed evidence of malicious intent.

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
  • MCP Tool PoisoningHidden Instructions, Unicode Deception, Parameter Description Injection
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
Findings (3)

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
97% confidence
Finding

The supplied chunk executes a third-party installer rather than performing Trello operations. No evidence establishes this installation as a supporting requirement for the declared skill. The downloaded script is not supplied, so its downstream actions cannot be determined.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

Piping a downloaded installer directly into Bash executes mutable remote code with the agent process's local permissions, without verifying its contents, signature, or expected digest. A compromised distribution endpoint could run arbitrary commands or steal accessible credentials; the missing-CLI condition limits exposure but does not remove the risk, and the PowerShell example has the same weakness.

Content

Scanner excerpt · SKILL.md (reported line 82)May include surrounding context.

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 103)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