CVE-2026-11719

Published: Jun 18, 2026Updated: Aug 17, 2026 Sources: CVE List NVDCWE-862

8.1HIGH

NVD MITRE

Description

An authenticated authorization bypass vulnerability exists in MCP Toolbox for Databases due to missing scope enforcement across older protocol handlers. While the 2025-11-25 protocol version handler correctly enforces per-tool restrictions defined by scopesRequired, older supported protocol versions (2025-06-18, 2025-03-26, and 2024-11-05) omit this check. An authenticated client with low-privilege tokens (e.g., read) can bypass the intended per-tool scope restrictions and execute high-privilege tools (e.g., admin) simply by specifying an older protocol version in the MCP-Protocol-Version header, or by omitting the header entirely (which causes the server to default to the vulnerable 2024-11-05 handler).

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:LPrivileges Required

Low

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:HConfidentiality

High

I:HIntegrity

High

A:NAvailability

None

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Weaknesses

CWE-862

Affected Products

Google

commercial·USaka google llc, google inc

mcp toolbox for databasesOn-premDatabase

Databases / db-tooling

MCP Toolbox for Databases (googleapis/mcp-toolbox)On-premDesktop App

Databases / db-tooling

Exploitability

Official Patch Available

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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques

Initial Access

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References

https://github.com/googleapis/mcp-toolbox/pull/3049

github.com

https://github.com/googleapis/mcp-toolbox/pull/3335

github.com

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