Dashboard / CVE-2026-16481

CVE-2026-16481

MEDIUM
MEDIUM Priority: 0.01 BB Relevance: 62/100
Published: 2026-07-27 Modified: 2026-10-24 First seen: 2026-10-29 Status: active

Attack Surface

Network Low Complexity No Interaction Conf. Impact

CVSS Vector Breakdown

AV: Network
AC: High
PR: Low
UI: None
S: X
AT: None
VC: High
VI: None
VA: None

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.

Weakness Classification (1)

Affected Software (1)

VendorProductVersion
google mcp_toolbox_for_databases 0.19.1 – 1.5.0

References & Advisories (1)

https://github.com/googleapis/mcp-toolbox/pull/3453
Patch Vendor Advisory Issue Tracking

Bug Bounty Relevance

62 / 100
✓ Network accessible
✓ Low complexity
✓ No user interaction

CVSS Score

6.0 / 10.0 v4.0
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS — Exploitation Probability

0.19%
Raw Score 0.001930
Percentile 9.0%
Date 2026-10-29

EPSS Trend

2026-10-29
0.00193
2026-10-28
0.00193

Intelligence Sources

nvd ref →

External Links