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Security audit

ActiveCampaign

Security checks for vulnerabilities and agentic risk

Overview

The ActiveCampaign workflow is coherent, but its setup instructions can automatically execute downloaded software without a separate approval or integrity check.

Review the automatic installation fallback before enabling this skill. Install the CLI yourself from a reviewed, verified release and require approval for future software installation. OOMOL mediates access to your ActiveCampaign account; use an appropriately scoped connection and retain the required confirmation for contact changes. The remote installers and service implementation were not inspected.

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 chunk performs remote installer execution and contains no ActiveCampaign data operations or demonstrated connection between the installer and ActiveCampaign functionality. Although dependency installation can be a supporting implementation detail, that relationship is not established here. The downloaded script's contents and further effects are not visible in the supplied code.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
97% confidence
Finding

Piping a mutable remote installer directly into bash executes its contents with the agent's local privileges without prior inspection or independent integrity verification. Compromise of the distribution endpoint or its supply chain could enable local data theft or modification; HTTPS does not protect against a compromised publisher. The Windows download-and-execute example presents the same underlying risk.

Content

Scanner excerpt · SKILL.md (reported line 60)May include surrounding context.

The setup workflow executes downloaded installation scripts without warning the user about remote code execution or system changes.

Medium
Category
Output Handling
Confidence
93% confidence
Finding

The fallback directs the agent to execute a downloaded installer without requiring user approval for local software installation or explaining its system effects. Although triggered only when the CLI is missing, this expands a CRM task into local code execution; the confirmation requirements for ActiveCampaign writes do not cover this operation.

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 81)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