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CVE-2026-11718

AI Predicted 9.1 Difficulty: Easy EPSS 0.20% · P11

Possible ATT&CK Techniques 1AI

T1199 · Trusted Relationship

Affected Version Matrix 1

VendorProductVersion RangeStatus
GoogleMCP Toolbox for Databases (googleapis/mcp-toolbox)1.0.0≤ 1.3.0affected
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I. Basic Information for CVE-2026-11718

Vulnerability Information
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Vulnerability Title
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Description
An authentication bypass vulnerability exists in the generic opaque token validation path (validateOpaqueToken) of googleapis/mcp-toolbox. When the toolbox validates an opaque token via an OAuth 2.0 introspection endpoint (RFC 7662), it decodes the response into an introspectResp struct. However, the subsequent claim-checking logic (validateClaims) evaluates the issuer condition as if a.issuer != "" && iss != "". If the external OAuth provider's introspection response omits the optional iss (issuer) field completely, the variable iss defaults to an empty string. This causes the conditional block to evaluate to false and be skipped silently. Consequently, the application accepts tokens issued by unauthorized or unintended third-party identity providers.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
认证机制不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Google MCP Toolbox for Databases (googleapis/mcp-toolbox) 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Google MCP Toolbox for Databases (googleapis/mcp-toolbox)是美国Google公司的一个数据库管理工具箱。 Google MCP Toolbox for Databases (googleapis/mcp-toolbox) 1.0.0版本至1.3.0及之前版本存在授权问题漏洞，该漏洞源于validateOpaqueToken路径中认证绕过问题，可能导致应用程序接受未经授权或非预期第三方身份提供商发布的令牌。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
GoogleMCP Toolbox for Databases (googleapis/mcp-toolbox) 1.0.0 ~ 1.3.0 -

II. Public POCs for CVE-2026-11718

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III. Intelligence Information for CVE-2026-11718

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Patches & Fixes for CVE-2026-11718 (1)

Same Patch Batch · Google · 2026-06-18 · 4 CVEs total

CVE-2026-11719Google MCP Toolbox for Databases (googleapis/mcp-toolbox) 授权问题漏洞
CVE-2026-11717Google MCP Toolbox for Databases (googleapis/mcp-toolbox) 授权问题漏洞
CVE-2026-28573Google Android 拒绝服务漏洞

IV. Related Vulnerabilities

Same product: MCP Toolbox for Databases (googleapis/mcp-toolbox)
Same vendor: Google
Same weakness: CWE-287

V. Comments for CVE-2026-11718

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