CVE-2026-11719
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).
How to fix
- github.com/googleapis/mcp-toolbox1.4.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| google mcp_toolbox_for_databases | 1.3.0 | — |
| github.com/googleapis/mcp-toolboxGo | v < 1.4.0 | 1.4.0 |
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