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Security audit

Workast

Security checks for vulnerabilities and agentic risk

Overview

The Workast workflow requires approval for data changes, but its setup fallback runs unverified installation scripts without a separate approval step.

Before enabling the setup fallback, review and explicitly approve the CLI installation, including its automatic skill installation and synchronization. Prefer a reviewed, pinned release. Decide whether you trust OOMOL with Workast access, and retain confirmation for every write. The remote installers and hosted connector implementation could not be verified.

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
97% confidence
Finding

The supplied chunk performs remote installer execution rather than any demonstrated Workast operation. No evidence establishes this installer as a supporting dependency for Workast, making its purpose and resource access inconsistent with the description. The downloaded script's contents and resulting actions are not available for assessment.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

Piping a remotely fetched script directly into bash executes mutable network content with the agent process's privileges, without independent integrity verification or review. Compromise of the distribution endpoint could therefore expose local files and credentials or modify the host; the adjacent PowerShell command has the same risk. The legitimate dependency-setup context and missing-CLI condition narrow exposure but do not remove this supply-chain risk.

Content

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

The fallback setup instructs the agent to execute downloaded installation scripts without warning the user about the system-level effects.

Medium
Category
Output Handling
Confidence
94% confidence
Finding

The fallback directs the agent to install software without requiring informed user approval for local system changes. The Workast write-confirmation rules do not cover software installation, so a routine Workast request could trigger an unexpected installation if execution permissions allow it.

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