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Security audit

Granola

Security checks for vulnerabilities and agentic risk

Overview

The Granola features fit their purpose, but a read-only request can trigger an unverified software installer without a separate approval step.

Review and explicitly approve CLI setup before allowing the agent to install it. Use a reviewed, fixed release and consider disabling automatic skill synchronization before invoking oo. Connect only the intended Granola account and consider OOMOL's access to meeting content. The bundled skill was fully inspected, but downloaded installer contents and backend behavior remain unverified; no malicious intent was established.

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
98% confidence
Finding

The supplied code performs remote software installation rather than searching or reading Granola data. Nothing in the chunk establishes that the Oomol installer is a supporting dependency for Granola functionality. The downloaded script's contents and further effects cannot be determined from this chunk.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

The command pipes a remotely fetched, unpinned script directly into Bash without checking its integrity or reviewing it; the PowerShell alternative uses the same download-and-execute pattern. If the distribution endpoint or release infrastructure is compromised, attacker-controlled code could execute with the agent process's permissions and access local files or credentials. HTTPS and conditional first-time setup reduce some exposure but do not verify the script's contents.

Content

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

The setup workflow executes remote installation scripts without warning about their system-level effects.

Medium
Category
Output Handling
Confidence
93% confidence
Finding

When the CLI is missing, the workflow directs installation without explaining that this executes third-party code and may modify the local environment, or requiring explicit approval. The missing-command condition limits exposure, but a read-only Granola request could still lead to unexpected software installation under the executing user's permissions.

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