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Security audit

Sage HR

Security checks for vulnerabilities and agentic risk

Overview

The HR reading workflow is coherent, but its automatic setup can execute unverified downloaded software without a separate approval step.

Review the setup before installing. Install a verified CLI release yourself and require approval before the agent runs downloaded installers. Review the CLI's bundled-skill synchronization and whether your organization permits OOMOL to handle employee data. The remote installers and connector implementation could not be verified; the artifact does not establish 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
  • 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
99% confidence
Finding

The supplied chunk executes an Oomol CLI installer rather than accessing Sage HR data. No connection between this installer and the declared Sage HR functionality is established, so it cannot be treated as merely a supporting implementation detail. The remote script's contents and any 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
98% confidence
Finding

The command pipes a mutable remote script directly into Bash without version pinning or integrity verification; the PowerShell alternative has the same execution pattern. Compromise of the distribution infrastructure could execute attacker-controlled code with the agent process's local permissions, although exploitation requires reaching setup and being permitted to run the installer.

Content

Scanner excerpt · SKILL.md (reported line 62)May include surrounding context.

The setup workflow executes downloaded installer scripts without warning about remote-code execution or system changes.

Medium
Category
Output Handling
Confidence
92% confidence
Finding

On a missing-CLI error, the workflow directs the agent to install software without explicitly obtaining approval for code execution and local system changes. The conditional setup limits exposure, but an ordinary read-only HR request could still trigger an installation the user did not authorize.

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 83)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