Vulnerability Details CVE-2026-11719
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).
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 4.1%
CVSS Severity
CVSS v3 Score 8.1
References
Products affected by CVE-2026-11719
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cpe:2.3:a:google:mcp_toolbox_for_databases:1.3.0