Google Sheets MCP — agentic threat model
The Google Sheets MCP agent presents a moderate-to-high risk profile due to its programmatic write and delete capabilities over Google Drive spreadsheets via OAuth. The primary risks are data integrity loss, formula injection, and unauthorized data exfiltration if integrated into an unconstrained agentic workflow.
OWASP AIVSS score rationale
| Autonomy of Action | 0.60 | |
| Goal-Driven Planning | 0.40 | |
| Self-Modification | 0.10 | |
| Dynamic Tool Use | 0.70 | |
| Persistent Memory | 0.20 | |
| Contextual Awareness | 0.50 | |
| Dynamic Identity | 0.60 | |
| Multi-Agent Interactions | 0.50 | |
| Non-Determinism | 0.40 | |
| Opacity & Reflexivity | 0.30 |
Scored with the canonical OWASP AIVSS formula (AIVSS calculator reference); agentic risk factors estimated from the agent’s described capabilities.
MAESTRO 7-layer threat model
Per-layer threats for this agent. Layers tagged “not certain from listing” are general, caveated commentary where the public description didn’t pin that layer.
Not certain from the listing — The underlying foundation model is not specified as this is an MCP connector; model-level threats like prompt injection or adversarial reprogramming depend entirely on the orchestrating LLM used.
Handles structured spreadsheet data. Threats include data poisoning (writing malicious payloads or formulas into cells) and data exfiltration of sensitive Drive-hosted spreadsheets.
Exposes powerful tools to read, write, format, and delete sheets. Insecure tool integration or lack of input validation could allow an LLM to execute destructive edits or inject malicious formulas programmatically.
Not certain from the listing — The hosting environment, network isolation, and sandboxing of the MCP server itself are not detailed in the public directory listing.
Not certain from the listing — There is no mention of built-in logging, auditing, or guardrails, though the description notes that confirmations on destructive edits are highly warranted.
Uses OAuth for authentication and authorization to access the user's Google Drive. While OAuth provides a standard security layer, over-scoped permissions could allow unauthorized access to non-target spreadsheets.
As an MCP tool, it is designed to be called by other agents. This introduces A2A trust abuse risks, where a compromised or rogue upstream agent could abuse this tool to wipe or exfiltrate spreadsheet data.
MAESTRO — the 7-layer agentic threat-modeling framework (Cloud Security Alliance / Ken Huang).