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Security audit

Smartsheet

Security checks for vulnerabilities and agentic risk

Overview

The Smartsheet workflow is sensible, but its setup can execute unverified downloaded code and introduce broader changes to your agent tools without clear approval.

Review and approve CLI installation separately, using a pinned and verified distribution. Decide whether OOMOL may install or synchronize skills across your agent tools, and disable that behavior if unwanted. Connecting Smartsheet entrusts OOMOL with account access and sheet operations; limit that access and retain the documented approval steps for changes and deletions. The downloaded installers remain unreviewed.

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
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • 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
Findings (5)

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
95% confidence
Finding

The supplied chunk performs remote software installation rather than Smartsheet operations. Although installation can be a supporting implementation detail, this code provides no evidence that the Oomol installer supports the declared Smartsheet functionality. The remote script's contents and any further effects cannot be determined from this chunk.

Content

No source excerpt is available for this finding.

Credential Access

High
Category
Privilege Escalation
Confidence
70% confidence
Finding

Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.

Content

Scanner excerpt · SKILL.md (reported line 43)May include surrounding context.

md
- `add_rows` — Add one or more rows to a Smartsheet sheet. [write]
- `delete_rows` — Delete one or more rows from a Smartsheet sheet. [destructive]
- `get_sheet` — Get a Smartsheet sheet with columns and rows.
- `list_sheets` — List sheets available to the authenticated Smartsheet access token.
- `update_rows` — Update one or more rows in a Smartsheet sheet. [write]

## Safety

External Script Fetching

High
Category
Supply Chain
Confidence
99% confidence
Finding

Piping a mutable HTTPS installer directly into bash executes whatever the endpoint supplies without verifying a specific release or reviewing the downloaded content. A compromised distribution endpoint could execute arbitrary code and access local files or credentials; the legitimate dependency purpose and missing-CLI condition reduce exposure but do not eliminate this supply-chain risk.

Content

Scanner excerpt · SKILL.md (reported line 59)May include surrounding context.

Fallback setup executes downloaded installation scripts without a user warning.

Medium
Category
Output Handling
Confidence
97% confidence
Finding

The fallback directs the agent to execute downloaded shell or PowerShell code without explicit installation approval or integrity verification. Although conditional on a missing CLI and relevant to the workflow, installation can execute arbitrary code with the agent's local privileges, exceeding ordinary Smartsheet operations.

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 80)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