CVE-2026-11719

published 2026-06-18

CVE-2026-11719: An authenticated authorization bypass vulnerability exists in MCP Toolbox for Databases due to missing scope enforcement across older protocol handlers. While…

Priority P3 56 high 8.6 CVSS 4.0

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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).

Affected

2 ranges

Vendor	Product	Version range	Fixed in
github.com	googleapis_mcp-toolbox	>= 0 < 1.4.0	1.4.0
google	mcp_toolbox_for_databases	—	—

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CWE-862