CVE-2026-11719
HighCVSS 8.6Exploitation Probability (EPSS)
Low risk5th percentile — higher than 5% of all known CVEs
Summary
An authenticated authorization bypass vulnerability exists in MCP Toolbox for Databases due to missing scope enforcement across older protocol handlers. An authenticated client with low-privilege tokens can access high-privilege tools by using an older protocol version.
Risk Assessment
The organization may be exposed to unauthorized access to sensitive administrative tools, potentially leading to serious security breaches.
Recommendation
It is recommended to update to the latest protocol version and implement additional access controls to mitigate this vulnerability.
Original NVD description (English source)
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).