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Security audit

HubSpot

Security checks for vulnerabilities and agentic risk

Overview

The HubSpot features have sensible safeguards, but setup can execute unverified remote software without separate approval.

Review and explicitly approve a verified CLI release before allowing setup, including any installation of additional agent skills. Connecting HubSpot authorizes OOMOL-mediated account access; grant only needed permissions and retain confirmation for CRM changes. The remote installer and live connector code were not available in the reviewed artifact.

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 (4)

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
96% confidence
Finding

The supplied code performs remote software installation rather than HubSpot data operations. Although dependency installation can be a supporting implementation detail, nothing in this chunk establishes that this installer supports the declared HubSpot functionality. The downloaded script's further behavior is not visible and cannot be assessed.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
97% confidence
Finding

The command pipes a mutable remote installer directly into Bash without verifying a pinned version, signature, or independently trusted digest; the PowerShell alternative has the same underlying issue. Compromise of the installation endpoint or delivery pipeline could execute arbitrary code with the invoking user's privileges, potentially exposing local credentials and files. The legitimate dependency and conditional fallback reduce suspicion of malicious intent but do not eliminate this supply-chain risk.

Content

Scanner excerpt · SKILL.md (reported line 80)May include surrounding context.

Fallback setup executes remote installation scripts without warning about local system changes.

Medium
Category
Output Handling
Confidence
91% confidence
Finding

The fallback directs installation of local software without requiring informed user approval or explaining potential system changes. A request to operate HubSpot does not necessarily authorize installing software; limiting installation to a missing-CLI error reduces frequency but does not establish 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 101)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