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Vulnerability Details :

CVE-2026-14541

Summary
Assigner-Google
Assigner Org ID-14ed7db2-1595-443d-9d34-6215bf890778
Published At-31 Jul, 2026 | 01:48
Updated At-31 Jul, 2026 | 16:14
Rejected At-
Credits

Authentication Bypass and Audience Confusion in MCP Toolbox OAuth Provider

An authentication bypass and audience confusion vulnerability exists in the Google OAuth provider component of Google mcp-toolbox version 1.4.0. When a Google authService is initialized with mcpEnabled: true but lacks an explicitly defined audience or clientId, the ValidateMCPAuth pipeline for opaque tokens skips audience validation entirely. As a result, the toolbox will accept any valid Google OAuth access token—even those minted for unrelated ecosystem applications—granting unauthorized clients access to protected tools and data backends.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:Google
Assigner Org ID:14ed7db2-1595-443d-9d34-6215bf890778
Published At:31 Jul, 2026 | 01:48
Updated At:31 Jul, 2026 | 16:14
Rejected At:
▼CVE Numbering Authority (CNA)
Authentication Bypass and Audience Confusion in MCP Toolbox OAuth Provider

An authentication bypass and audience confusion vulnerability exists in the Google OAuth provider component of Google mcp-toolbox version 1.4.0. When a Google authService is initialized with mcpEnabled: true but lacks an explicitly defined audience or clientId, the ValidateMCPAuth pipeline for opaque tokens skips audience validation entirely. As a result, the toolbox will accept any valid Google OAuth access token—even those minted for unrelated ecosystem applications—granting unauthorized clients access to protected tools and data backends.

Affected Products
Vendor
Google LLCGoogle
Product
mcp-toolbox
Default Status
unaffected
Versions
Affected
  • 1.4.0 (semver)
Problem Types
TypeCWE IDDescription
CWECWE-287CWE-287 (Improper Authentication)
Type: CWE
CWE ID: CWE-287
Description: CWE-287 (Improper Authentication)
Metrics
VersionBase scoreBase severityVector
4.08.0HIGH
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/E:U
Version: 4.0
Base score: 8.0
Base severity: HIGH
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/E:U
Metrics Other Info
Impacts
CAPEC IDDescription
CAPEC-115CAPEC-115 Authentication Bypass
CAPEC ID: CAPEC-115
Description: CAPEC-115 Authentication Bypass
Solutions

Configurations

Workarounds

Exploits

Credits

finder
HE WEI (ギカク)
Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://github.com/googleapis/mcp-toolbox/pull/3450
N/A
Hyperlink: https://github.com/googleapis/mcp-toolbox/pull/3450
Resource: N/A
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:cve-coordination@google.com
Published At:31 Jul, 2026 | 03:16
Updated At:31 Jul, 2026 | 17:16

An authentication bypass and audience confusion vulnerability exists in the Google OAuth provider component of Google mcp-toolbox version 1.4.0. When a Google authService is initialized with mcpEnabled: true but lacks an explicitly defined audience or clientId, the ValidateMCPAuth pipeline for opaque tokens skips audience validation entirely. As a result, the toolbox will accept any valid Google OAuth access token—even those minted for unrelated ecosystem applications—granting unauthorized clients access to protected tools and data backends.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.08.0HIGH
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/E:U/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
N/A
Type: Secondary
Version: 4.0
Base score: 8.0
Base severity: HIGH
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/E:U/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
Type: N/A
Version:
Base score:
Base severity: N/A
Vector:
CPE Matches

Weaknesses
CWE IDTypeSource
CWE-287Secondarycve-coordination@google.com
CWE ID: CWE-287
Type: Secondary
Source: cve-coordination@google.com
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://github.com/googleapis/mcp-toolbox/pull/3450cve-coordination@google.com
N/A
Hyperlink: https://github.com/googleapis/mcp-toolbox/pull/3450
Source: cve-coordination@google.com
Resource: N/A

Change History

0
Information is not available yet

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Rejected-Not Available
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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.

Action-Not Available
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Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available

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Known To Be Used In Ransomware Campaigns?-Not Available
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Details not found