CVE-2026-16481

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.

CVSS

No CVSS.

References

Link	Resource
https://github.com/googleapis/mcp-toolbox/pull/3453

Configurations

No configuration.

History

27 Jul 2026, 19:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-07-27 19:17

Updated : 2026-07-30 14:15

NVD link : CVE-2026-16481

Mitre link : CVE-2026-16481

CVE.ORG link : CVE-2026-16481

JSON object : View

Products Affected

No product.

CWE

CWE-918

Server-Side Request Forgery (SSRF)

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