---
id: "CVE-2026-93328"
kind: "vulnerability"
aliases: ["CVE-2026-93328"]
title: "Google MCP Toolbox: cloud-storage flaw lets attackers read and overwrite host files"
severity: "critical"
cvss: 9.3
epss: null
exploited: false
status: "open"
category: "ai-tooling"
products: []
ecosystems: []
tags: ["ai-tooling", "cloud-storage", "google-cloud", "mcp", "self-hosted"]
not_affected_if: ["cloud-storage-source-disabled", "version-outside-1.2.0-1.4.0"]
published_at: "2026-10-26T15:16:45+00:00"
first_seen_at: "2026-10-26T16:02:26+00:00"
updated_at: "2026-10-26T16:03:33+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93328", "first_seen_at": "2026-10-26T16:02:26+00:00"}]
---

# Google MCP Toolbox: cloud-storage flaw lets attackers read and overwrite host files

Google Cloud MCP Toolbox for Databases, versions 1.2.0 through 1.4.0, has a path traversal and missing authorization flaw in its cloud-storage source. An unauthenticated remote attacker can send crafted tool invocation parameters to copy host files to external Google Cloud Storage buckets and overwrite arbitrary local files.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed toolbox version with `toolbox --version` or the running container image tag; versions `1.2.0` through `1.4.0` are affected.
- Check whether the cloud-storage source is configured in the toolbox tools file (`tools.yaml`).

## Fix

- Upgrade Google Cloud MCP Toolbox for Databases to a version later than `1.4.0`; the sources do not name the fixed version, so check the googleapis/mcp-toolbox release notes.
- Until upgraded, remove or disable the cloud-storage source from the toolbox configuration.

## Timeline

- 2026-10-26T16:02:26+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-93328

## From the sources

Path Traversal and Missing Authorization in cloud-storage source in Google Cloud MCP Toolbox for Databases (googleapis/mcp-toolbox) versions 1.2.0 through 1.4.0 allows an unauthenticated remote attacker to exfiltrate host files to external Google Cloud Storage buckets and overwrite arbitrary local files via crafted tool invocation parameters.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_