CVE-2026-16481 Details
Description
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.
A Server-Side Request Forgery (SSRF) vulnerability has been identified in the Google Cloud Healthcare FHIR Fetch Page Tool, part of the Google APIs MCP Toolbox. This vulnerability allows for credential exfiltration by exploiting an unvalidated pageURL parameter. The tool sends HTTP GET requests to URLs specified by the client, using an authenticated client that automatically includes an Authorization: Bearer header. An attacker can manipulate the pageURL parameter to send OAuth or service account access tokens to an external listener. This could potentially expose Protected Health Information (PHI) and access to secondary Google Cloud Platform services, depending on the token leaked.
Users are advised to update to the latest version of the Google Cloud Healthcare FHIR Fetch Page Tool, where this vulnerability has been addressed.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No CVSS 3.x data is available for this CVE.
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jul 27, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/googleapis/mcp-toolbox/pull/3453 | [email protected] |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-918 | Server-Side Request Forgery (SSRF) | [email protected] |
Affected Products
No affected product data is available for this CVE.
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 10, 2026 | CVE Modified | [email protected] |
| Jul 27, 2026 | CVE Modified | CISA-ADP |
| Jul 27, 2026 | New CVE Received | [email protected] |