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SCA: security update for github.com/googleapis/mcp-toolbox (GHSA-8fcc-w5hv-4gxv)

critical Tenable Cloud Security Plugin ID 443610

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - An authentication bypass vulnerability exists in the generic opaque token validation path
 (validateOpaqueToken) of googleapis/mcp-toolbox. When verifying an unparsed opaque token via an OAuth 2.0
 introspection endpoint (RFC 7662), the toolbox decodes the response into an introspectResp struct where
 the Active field is declared as a pointer to a boolean (*bool). The code only explicitly rejects a token
 if the response contains a populated active field set to false (if introspectResp.Active != nil &&
 !*introspectResp.Active). If an introspection endpoint responds with a payload that completely omits the
 mandatory active key, the internal variable remains nil, causing the conditional check to short-circuit.
 As a result, Toolbox accepts authorization tokens missing the "active" field, granting access to protected
 tools and underlying data sources. (CVE-2026-11717)

Solution

Update the github.com/googleapis/mcp-toolbox library and its related packages to version 1.4.0 or later.

See Also

https://github.com/advisories/GHSA-8fcc-w5hv-4gxv

Plugin Details

Severity: Critical

ID: 443610

Version: Revision 1.5

Type: Local

Family: SCA Checks

Published: 6/19/2026

Updated: 7/2/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 57.96

Vendor

Vendor Severity: Critical

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS Score Source: CVE-2026-11717

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: Critical

Base Score: 9.3

Threat Score: 8

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 6/18/2026

Vulnerability Publication Date: 6/18/2026

Reference Information

CVE: CVE-2026-11717

cwe: CWE-287