---
id: CVE-2026-16481
title: >-
  A Server-Side Request Forgery (SSRF) and credential exfiltration vulnerability
  exists in the cloud-healthcare-fhir-fetch-page tool of googleapis/mcp-toolbox.


  The tool takes an unvalidated pageURL parameter from the client and issues an
  …
summary: >-
  A Server-Side Request Forgery (SSRF) and credential exfiltration vulnerability
  exists in the cloud-healthcare-fhir-fetch-page tool of googleapis/mcp-toolbox.


  The tool takes an unvalidated pageURL parameter from the client and issues an
  …
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-918
vendor: google
product: mcp_toolbox_for_databases
affected:
  - 'mcp_toolbox_for_databases >= 0.19.1, < 1.5.0'
patched:
  - mcp_toolbox_for_databases 1.5.0
published: '2026-07-27'
updated: '2026-09-28'
sourceUpdated: '2026-09-28T13:44:19.913'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-16481'
references:
  - url: 'https://github.com/googleapis/mcp-toolbox/pull/3453'
    label: cve-coordination@google.com
tags:
  - nvd
  - cve.org
epss: 0.00193
epssPercentile: 0.08863
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-07-27T19:35:22.831604Z'
scores:
  nvd: 7.5
  cna: 6
ingestedAt: '2026-09-11T11:32:42.890Z'
---

## Overview

A Server-Side Request Forgery (SSRF) and credential exfiltration vulnerability exists in the cloud-healthcare-fhir-fetch-page tool of googleapis/mcp-toolbox.

The tool takes an unvalidated pageURL parameter from the client and issues an HTTP GET request to it using an authenticated client. The underlying transport automatically attaches an Authorization: Bearer  header to every outbound request regardless of the destination host. An attacker can supply an arbitrary external URL to the pageURL parameter (either directly via the tool execution payload or implicitly via data-driven pagination tracking loops), leading Toolbox into sending its OAuth/service-account access token to an attacker-controlled listener. Depending on the configuration, this leaks either the end-user's token or the broader service-account access token (ADC), potentially exposing Protected Health Information (PHI) and secondary Google Cloud Platform services.

## Affected

- `mcp_toolbox_for_databases >= 0.19.1, < 1.5.0`

## Remediation

Upgrade past the affected range:

- `mcp_toolbox_for_databases 1.5.0`